Full Changelog¶
3.2 (unreleased)¶
New Features¶
astropy.config¶
astropy.constants¶
astropy.convolution¶
astropy.coordinates¶
astropy.cosmology¶
astropy.extern¶
astropy.io.ascii¶
- IPAC tables now output data types of
float
instead ofdouble
, orint
instead oflong
, based on the columndtype.itemsize
. [#8216]
astropy.io.fits¶
astropy.io.votable¶
astropy.modeling¶
astropy.nddata¶
astropy.samp¶
astropy.stats¶
astropy.table¶
- Improved the Table - pandas
DataFrame
interface (to_pandas()
andfrom_pandas()
). Mixin columns likeTime
andQuantity
can now be converted to pandas by flattening the columns as necessary to plain columns.Time
andTimeDelta
columns get converted to corresponding pandas date or time delta types. TheDataFrame
index is now handled in the conversion methods. [#8247]
astropy.tests¶
astropy.time¶
astropy.uncertainty¶
astropy.units¶
astropy.utils¶
astropy.visualization¶
astropy.wcs¶
API Changes¶
astropy.config¶
astropy.constants¶
astropy.convolution¶
astropy.coordinates¶
astropy.cosmology¶
astropy.extern¶
astropy.io.ascii¶
- IPAC tables now output data types of
float
instead ofdouble
, orint
instead oflong
, based on the columndtype.itemsize
. [#8216]
astropy.io.misc¶
astropy.io.fits¶
astropy.io.registry¶
astropy.io.votable¶
astropy.modeling¶
astropy.nddata¶
astropy.samp¶
astropy.stats¶
astropy.table¶
astropy.tests¶
astropy.time¶
astropy.uncertainty¶
astropy.units¶
astropy.utils¶
astropy.visualization¶
astropy.wcs¶
Bug Fixes¶
astropy.config¶
astropy.constants¶
astropy.convolution¶
astropy.coordinates¶
astropy.cosmology¶
astropy.extern¶
astropy.io.ascii¶
astropy.io.misc¶
astropy.io.fits¶
astropy.io.registry¶
astropy.io.votable¶
astropy.modeling¶
astropy.nddata¶
astropy.samp¶
astropy.stats¶
astropy.table¶
astropy.tests¶
astropy.time¶
astropy.uncertainty¶
astropy.units¶
astropy.utils¶
astropy.visualization¶
astropy.wcs¶
3.1.1 (unreleased)¶
Bug fixes¶
astropy.config¶
astropy.constants¶
astropy.convolution¶
astropy.coordinates¶
astropy.cosmology¶
astropy.extern¶
astropy.io.misc¶
astropy.io.fits¶
fitsdiff --ignore-hdus
now prints input filenames in the diff report instead of<HDUList object at 0x1150f9778>
. [#8295]
astropy.io.registry¶
astropy.io.votable¶
astropy.modeling¶
astropy.nddata¶
astropy.samp¶
astropy.stats¶
astropy.table¶
astropy.tests¶
astropy.time¶
astropy.uncertainty¶
astropy.units¶
astropy.utils¶
astropy.visualization¶
astropy.wcs¶
Other Changes and Additions¶
3.1 (2018-12-06)¶
New Features¶
astropy.convolution¶
astropy.coordinates¶
- The
SkyCoord.from_name
constructor now has the ability to create coordinate objects by parsing object catalogue names that have embedded J-coordinates. [#7830] - The new function
make_transform_graph_docs
can be used to create a docstring graph from a customTransformGraph
object. [#7135] KDTree
for catalog matching is now built with sliding midpoint rule rather than standard. In code, this means settingcompact_nodes=False
andbalanced_tree=False
incKDTree
. The sliding midpoint rule is much more suitable for catalog matching, and results in 1000x speedup in some cases. [#7324]- Additional information about a site loaded from the Astropy sites registry is
now available in
EarthLocation.info.meta
. [#7857] - Added a
concatenate_representations
function to combine coordinate representation data and any associated differentials. [#7922] BaseCoordinateFrame
will now check for a method named_astropy_repr_in_frame
when constructing the string forms of attributes. Allowing any class to control howBaseCoordinateFrame
represents it when it is an attribute of a frame. [#7745]- Some rarely-changed attributes of frame classes are now cached, resulting in
speedups (up to 50% in some cases) when creating new scalar frame or
SkyCoord
objects. [#7949, #5952] - Added a
directional_offset_by
method toSkyCoord
that computes a new coordinate given a coordinate, position angle, and angular separation [#5727]
astropy.cosmology¶
- The default cosmology has been changed from
WMAP9
toPlanck15
. [#8123] - Distance calculations with
LambaCDM
with no radiation (T_CMB0=0) are now 20x faster by using elliptic integrals for non-flat cases. [#7155] - Distance calculations with
FlatLambaCDM
with no radiation (T_CMB0=0) are now 20x faster by using the hypergeometric function solution for this special case. [#7087] - Age calculations with
FlatLambdaCDM
with no radiation (Tcmb0=0) are now 1000x faster by using analytic solutions instead of integrating. [#7117]
astropy.io.ascii¶
- Latex reader now ignores
\toprule
,\midrule
, and\bottomrule
commands. [#7349] - Added the RST (Restructured-text) table format and the fast version of the RDB reader to the set of formats that are guessed by default. [#5578]
- The read trace (used primarily for debugging) now includes guess argument
sets that were skipped entirely e.g. for not supporting user-supplied kwargs.
All guesses thus removed from
filtered_guess_kwargs
are now listed as “Disabled” at the beginning of the trace. [#5578] - Emit a warning when reading an ECSV file without specifying the
format
and without PyYAML installed. Previously this silently fell through to parsing as a basic format file and the file metadata was lost. [#7580] - Optionally allow writing masked columns to ECSV with the mask explicitly specified as a separate column instead of marking masked elements with “” (empty string). This allows handling the case of a masked string column with “” data rows. [#7481]
astropy.io.misc¶
- Added support for saving all representation classes and many coordinate frames to the asdf format. [#7079]
- Added support for saving models with units to the asdf format. [#7237]
- Added a new
character_as_bytes
keyword to the HDF5 Table reading function to control whether byte string columns in the HDF5 file are left as bytes or converted to unicode. The default is to read as bytes (character_as_bytes=True
). [#7024, #8017]
astropy.io.fits¶
HDUList.pop()
now accepts string and tuple extension name specifications. [#7236]- Add an
ignore_hdus
keyword toFITSDiff
to allow ignoring HDUs by NAME when diffing two FITS files [#7538] - Optionally allow writing masked columns to FITS with the mask explicitly
specified as a separate column instead of using the FITS standard of
certain embedded null values (
NaN
for float,TNULL
for integers). This can be used to work around limitations in the FITS standard. [#7481] - All time coordinates can now be written to and read from FITS binary tables, including those with vectorized locations. [#7430]
- The
fitsheader
command line tool now supports adfits+fitsort
mode, and the dotted notation for keywords (e.g.ESO.INS.ID
). [#7240] - Fall back to reading arrays using mode=’denywrite’ if mode=’readonly’ fails when using memory-mapping. This solves cases on some platforms when the available address space was less than the file size (even when using memory mapping). [#7926]
astropy.modeling¶
- Add a
Multiply
model which preserves unit through evaluate, unlikeScale
which is dimensionless. [#7210] - Add a
uses_quantity
property toModel
which allows introspection of if theModel
can acceptQuantity
objects. [#7417] - Add a
separability_matrix
function which returns the correlation matrix of inputs and outputs. [#7803] - Fixed compatibility of
JointFitter
with the latest version of Numpy. [#7984] - Add
prior
andposterior
constraints to modeling parameters. These are not used by any current fitters, but are provided to allow user code to experiment with Bayesian fitters. [#7558]
astropy.nddata¶
astropy.stats¶
- Add an
astropy.stats.bls
module with an implementation of the “box least squares” periodogram that is commonly used for discovering transiting exoplanets and eclipsing binaries. [#7391]
astropy.table¶
- Added support for full use of
Time
mixin column for join, hstack, and vstack table operations. [#6888] - Added a new table index engine,
SCEngine
, based on the Sorted Containers package. [#7574] - Add a new keyword argument
serialize_method
toTable.write
to control howTime
andMaskedColumn
columns are written. [#7481] - Allow mixin columns to be used in table
group
andunique
functions. This applies to both the key columns and the other data columns. [#7712] - Added support for stacking
Column
, mixin column (e.g.Quantity
,Time
) or column-like objects. [#7674] - Added support for inserting a row into a Table that has
Time
orTimeDelta
column(s). [#7897]
astropy.tests¶
- Added an option
--readonly
to the test command to change the permissions on the temporary installation location to read-only. [#7598]
astropy.time¶
- Allow array-valued
Time
object to be modified in place. [#6028] - Added support for missing values (masking) to the
Time
class. [#6028] - Added supper for a ‘local’ time scale (for free-running clocks, etc.), and round-tripping to the corresponding FITS time scale. [#7122]
- Added
datetime.timedelta
format class forTimeDelta
. [#7441] - Added
strftime
andstrptime
methods toTime
class. These methods are similar to those in the Python standard librarytime
package and provide flexible input and output formatting. [#7323] - Added
datetime64
format to theTime
class to support working withnumpy.datetime64
dtype arrays. [#7361] - Add fractional second support for
strftime
andstrptime
methods ofTime
class. [#7705] - Added an
insert
method to allow inserting one or more values into aTime
orTimeDelta
object. [#7897] - Remove timescale from string version of FITS format time string. The timescale is not part of the FITS standard and should not be included. This change may cause some compatibility issues for code that relies on round-tripping a FITS format string with a timescale. Strings generated from previous versions of this package are still understood but a DeprecationWarning will be issued. [#7870]
astropy.uncertainty¶
- This sub-package was added as a “preview” (i.e. API unstable), containing
the
Distribution
class and associated convenience functions. [#6945]
astropy.units¶
- Add complex numbers support for
Quantity._repr_latex_
. [#7676] - Add
thermodynamic_temperature
equivalency to convert between Jy/beam and “thermodynamic temperature” for cosmology. [#7054] - Add millibar unit. [#7863]
- Add maggy and nanomaggy unit, as well as associated
zero_point_flux
equivalency. [#7891] AB
andST
are now enabled by default, and have alternate namesABflux
andSTflux
. [#7891]- Added
littleh
unit and associatedwith_H0
equivalency. [#7970]
astropy.visualization¶
- Added
imshow_norm
function, which combines imshow and creation of aImageNormalize
object. [#7785]
astropy.visualization.wcsaxes¶
- Add support for setting
set_separator(None)
in WCSAxes to use default separators. [#7570] - Added two keyword argument options to
CoordinateHelper.set_format_unit
:decimal
can be used to specify whether to use decimal formatting for the labels (by default this is False for degrees and hours and True otherwise), andshow_decimal_unit
can be used to determine whether the units should be shown for decimal labels. [#7318] - Added documentation for
transform=
andcoord_meta=
. [#7698] - Allow
coord_meta=
to optionally includeformat_unit=
. [#7848] - Add support for more rcParams related to the grid, ticks, and labels, and should work with most built-in Matplotlib styles. [#7961]
- Improved rendering of outward-facing ticks. [#7961]
- Add support for
tick_params
(which is a standard Matplotlib function/method) on both theWCSAxes
class and the individualCoordinateHelper
classes. Note that this is provided for compatibility with Matplotlib syntax users may be familiar with, but it is not the preferred way to change settings. Instead, methods such asset_ticks
should be preferred. [#7969] - Moved the argument
exclude_overlapping
fromset_ticks
toset_ticklabel
. [#7969] - Added a
pad=
argument toset_ticklabel
to provide a way to control the padding between ticks and tick labels. [#7969] - Added support for setting the tick direction in
set_ticks
using thedirection=
keyword argument. [#7969]
astropy.wcs¶
- Map ITRS frames to terrestrial WCS coordinates. This will make it possible to
use WCSAxes to make figures that combine both celestial and terrestrial
features. An example is plotting the coordinates of an astronomical transient
over an all- sky satellite image to illustrate the position relative to the
Earth at the time of the event. The ITRS frame is identified with WCSs that
use the
TLON-
andTLAT-
coordinate types. There are several examples of WCSs where this syntax is used to describe terrestrial coordinate systems: Section 7.4.1 of WCS in FITS “Paper II” and the WCSTools documentation. [#6990] - Added the abstract base class for the low-level WCS API described in APE 14 (https://doi.org/10.5281/zenodo.1188875). [#7325]
- Add
WCS.contains()
function to check if the WCS footprint contains a given sky coordinate. [#7273] - Added the abstract base class for the high-level WCS API described in APE 14 (https://doi.org/10.5281/zenodo.1188875). [#7325]
- Added the high-level wrapper class for low-level WCS objects as described in APE 14 (https://doi.org/10.5281/zenodo.1188875). [#7326]
- Added a new property
WCS.has_distortion
. [#7326] - Deprecated
_naxis1
and_naxis2
in favor ofpixel_shape
. [#7973] - Added compatibility to wcslib version 6. [#8093]
API Changes¶
astropy.convolution¶
kernel
can now be a tuple. [#7561]- Not technically an API changes, however, the doc string indicated that
boundary=None
was the default when actually it isboundary='fill'
. The doc string has been corrected, however, someone may interpret this as an API change not realising that nothing has actually changed. [#7293] interpolate_replace_nans()
can no longer accept the keyword argumentpreserve_nan
. It is explicitly set toFalse
. [#8088]
astropy.coordinates¶
- Fixed
astropy.coordinates.concatenate
to include velocity data in the concatenation. [#7922] - Changed the name of the single argument to
Frame.realize_frame()
from the (incorrect)representation_type
todata
. [#7923] - Negative parallaxes passed to
Distance()
now raise an error by default (allow_negative=False
), or are converted to NaN values with a warning (allow_negative=True
). [#7988] - Negating a
SphericalRepresentation
object now changes the angular coordinates (by rotating 180º) instead of negating the distance. [#7988] - Creation of new frames now generally creates copies of frame attributes, rather than inconsistently either copying or making references. [#8204]
- The frame class method
is_equivalent_frame
now checks for equality of components to determine if a frame is the same when it has frame attributes that are representations, rather than checking if they are the same object. [#8218]
astropy.io.ascii¶
- If a fast reader is explicitly selected (e.g.
fast_reader='force'
) and options which are incompatible with the fast reader are provided (e.g.quotechar='##'
) then now aParameterError
exception will be raised. [#5578] - The fast readers will now raise
InconsistentTableError
instead ofCParserError
if the number of data and header columns do not match. [#5578] - Changed a number of
ValueError
exceptions toInconsistentTableError
in places where the exception is related to parsing a table which is inconsistent with the specified table format. Note thatInconsistentTableError
inherits fromValueError
so no user code changes are required. [#7425]
astropy.io.fits¶
- The
fits.table_to_hdu()
function will translate any columnformat
attributes to a TDISPn format string, if possible, and store it as a TDISPn keyword in theHDU
header. [#7226]
astropy.modeling¶
- Change the order of the return values from
FittingWithOutlierRemoval
, such thatfitted_model
comes first, for consistency with other fitters. For the second value, return only a boolean outliermask
, instead of the previousMaskedArray
(which included a copy of the input data that was both redundant and inadvertently corrupted at masked points). Return a consistent type for the second value whenniter=0
. [#7407] - Set the minimum value for the
bolometric_flux
parameter of theBlackBody1D
model to zero. [#7045]
astropy.nddata¶
- Add two new uncertainty classes,
astropy.nddata.VarianceUncertainty
andastropy.nddata.InverseVariance
. [#6971]
astropy.stats¶
- String values can now be used for the
cenfunc
andstdfunc
keywords in theSigmaClip
class andsigma_clip
andsigma_clipped_stats
functions. [#7478] - The
SigmaClip
class andsigma_clip
andsigma_clipped_stats
functions now have amasked
keyword, which can be used to return either a masked array (default) or an ndarray with the min/max values. [#7478] - The
iters
keyword has been renamed (and deprecated) tomaxiters
in theSigmaClip
class andsigma_clip
andsigma_clipped_stats
functions. [#7478]
astropy.table¶
astropy.tests¶
from astropy.tests.helper import *
no longer includesquantity_allclose
. However,from astropy.tests.helper import quantity_allclose
would still work. [#7381]warnings_to_ignore_by_pyver
option inenable_deprecations_as_exceptions()
now takesNone
as key. Any deprecation message that is mapped toNone
will be ignored regardless of the Python version. [#7790]
astropy.time¶
- Added the ability to use
local
as time scale inTime
andTimeDelta
. [#6487] - Comparisons, addition, and subtraction of
Time
instances with non-time instances will now returnNotImplemented
rather than raise theTime
-specificOperandTypeError
. This will generally lead to a regularTypeError
. As a result,OperandTypeError
now only occurs if the operation is betweenTime
instances of incompatible type or scale. [#7584]
astropy.units¶
astropy.utils¶
InheritDocstrings
now also works on class properties. [#7166]diff_values()
,report_diff_values()
, andwhere_not_allclose()
utility functions are moved fromastropy.io.fits.diff
. [#7444]invalidate_caches()
has been removed from theastropy.utils.compat
namespace, use it directly fromimportlib
. [#7872]
astropy.visualization¶
- In
ImageNormalize
, the default forclip
is set toTrue
. [#7800] - Changed
AsymmetricPercentileInterval
andMinMaxInterval
to ignore NaN values in arrays. [#7360] - Automatically default to using
grid_type='contours'
in WCSAxes when using a customTransform
object if the transform has no inverse. [#7847]
Performance Improvements¶
- Reduced import time by more cautious use of the standard library. [#7647]
astropy.convolution¶
- Major performance overhaul to
convolve()
. [#7293] convolve()
: Boundariesfill
,extend
, andwrap
now use a single implementation that pads the image with the correct boundary values before convolving. The runtimes of these three were significantly skewed. They now have equivalent runtimes that are also faster than before due to performant contiguous memory access. However, this does increase the memory footprint as an entire new image array is required plus that needed for the padded region.[#7293]convolve()
: Core computation ported from Cython to C. Several optimization techniques have been implemented to achieve performance gains, e.g. compiler hoisting, and vectorization, etc. Compiler optimization level-O2
required for hoisting and-O3
for vectorization. [#7293]convolve()
:nan_treatment=‘interpolate’
was slow to compute irrespective of whether any NaN values exist within the array. The input array is now checked for NaN values and interpolation is disabled if non are found. This is a significant performance boost for arrays without NaN values. [#7293]
astropy.coordinates¶
- Sped up creating SkyCoord objects by a factor of ~2 in some cases. [#7615]
- Sped up getting xyz vectors from
CartesianRepresentation
(which is used a lot internally). [#7638] - Sped up transformations and some representation methods by replacing
python code with (compiled)
erfa
ufuncs. [#7639] - Sped up adding differential (velocity) data to representations by a factor of ~20, which improves the speed of frame and SkyCoord initialization. [#7924]
- Refactored
SkyCoord
initializer to improve performance and code clarity. [#7958] - Sped up initialization of
Longitude
by ~40%. [#7616]
astropy.stats¶
- The
SigmaClip
class andsigma_clip
andsigma_clipped_stats
functions are now significantly faster. [#7478] - A Cython implementation for
astropy.stats.kuiper_two
and a vectorized implementation forastropy.stats.kuiper_false_positive_probability
have been added, speeding up both functions. [#8104]
astropy.units¶
Bug Fixes¶
astropy.convolution¶
- Fixed bug in
convolve_fft
where masked input was copied withnumpy.asarray
instead ofnumpy.asanyarray
.numpy.asarray
removes the mask subclass causingnumpy.ma.ismasked(input)
to fail, causingconvolve_fft
to ignore all masked input. [#8137] - Remove function side-effects of input data from
convolve_fft
. It was possible for input data to remain modified if particular exceptions were raised. [#8152]
astropy.coordinates¶
EarthLocation.of_address
now uses the OpenStreetMap geocoding API by default to retrieve coordinates, with the Google API (which now requires an API key) as an option. [#7918]- Fixed a bug that caused frame objects with NaN distances to have NaN sky positions, even if valid sky coordinates were specified. [#7988]
- Fixed
represent_as()
to not round-trip through cartesian if the same representation class as the instance is passed in. [#7988]
astropy.io.ascii¶
astropy.io.misc¶
- Fixed bug when writing a table with masked columns to HDF5. Previously
the mask was being silently dropped. If the
serialize_meta
option is enabled the data mask will now be written as an additional column and the masked columns will round-trip correctly. [#7481] - Fixed a bug where writing to HDF5 failed for for tables with columns of unicode strings. Now those columns are first encoded to UTF-8 and written as byte strings. [#7024, #8017]
- Fixed a bug with serializing the bounding_box of models initialized
with
Quantities
. [#8052]
astropy.io.fits¶
astropy.modeling¶
astropy.nddata¶
astropy.tests¶
- Fixing bug that prevented to run the doctests on only a single rst documentation file rather than all of them. [#8055]
astropy.time¶
- Fix a bug when setting a
TimeDelta
array item with plain float value(s). This was always interpreted as a JD (day) value regardless of theTimeDelta
format. [#7990]
astropy.units¶
- To simplify fast creation of
Quantity
instances from arrays, one can now writearray << unit
(equivalent toQuantity(array, unit, copy=False)
). Ifarray
is already aQuantity
, this will convert the quantity to the requested units; in-place conversion can be done withquantity <<= unit
. [#7734]
astropy.utils¶
Other Changes and Additions¶
- The documentation build now uses the Sphinx configuration from sphinx-astropy rather than from astropy-helpers. [#7139]
- Versions of Numpy <1.13 are no longer supported. [#7058]
- Running tests now suppresses the output of the installation stage by default,
to allow easier viewing of the test results. To re-enable the output as
before, use
python setup.py test --verbose-install
. [#7512] - The ERFA functions are now wrapped in ufuncs instead of custom C code,
leading to some speed improvements, and setting the stage for allowing
overrides with
__array_ufunc__
. [#7502] - Updated the bundled CFITSIO library to 3.450. See
cextern/cfitsio/docs/changes.txt
for additional information. [#8014] - The
representation
keywords in coordinate frames are now deprecated in favor of therepresentation_type
keywords (which are less ambiguously named). [#8119]
3.0.5 (2018-10-14)¶
3.0.4 (2018-08-02)¶
API Changes¶
astropy.table¶
- The private
_parent
attribute in theinfo
attribute of table columns was changed from a direct reference to the parent column to a weak reference. This was in response to a memory leak caused by having a circular reference cycle. This change means that expressions likecol[3:5].info
will now fail because at the point of theinfo
property being evaluated thecol[3:5]
weak reference is dead. Instead force a reference withc = col[3:5]
followed byc.info.indices
. [#6277, #7448]
Bug Fixes¶
astropy.nddata¶
- Fixed an bug when creating the
WCS
of a cutout (seenddata.Cutout2D
) when input image’sWCS
containsSIP
distortion corrections by adjusting thecrpix
of theastropy.wcs.Sip
(in addition to adjusting thecrpix
of theastropy.wcs.WCS
object). This bug had the potential to produce large errors inWCS
coordinate transformations depending on the position of the cutout relative to the input image’scrpix
. [#7556, #7550]
astropy.table¶
astropy.wcs¶
- Fixed an bug when creating the
WCS
slice (seeWCS.slice()
) whenWCS
containsSIP
distortion corrections by adjusting theWCS.sip.crpix
in addition to adjustingWCS.wcs.crpix
. This bug had the potential to produce large errors inWCS
coordinate transformations depending on the position of the slice relative toWCS.wcs.crpix
. [#7556, #7550]
3.0.3 (2018-06-01)¶
3.0.2 (2018-04-23)¶
Bug Fixes¶
astropy.coordinates¶
- Computing a 3D separation between two
SkyCoord
objects (with theseparation_3d
method) now works with or without velocity data attached to the objects. [#7387]
astropy.modeling¶
FittingWithOutlierRemoval
now handles model sets, as long as the underlying fitter supports masked values. [#7199]- Remove assumption that
model_set_axis == 0
for 2D models inLinearLSQFitter
. [#7317, #7199] - Fix the shape of the outputs when a model set is evaluated with
model_set_axis=False
. [#7317]
astropy.stats¶
- Accept a tuple for the
axis
parameter insigma_clip
, like the underlyingnumpy
functions and some other functions instats
. [#7199]
3.0.1 (2018-03-12)¶
Bug Fixes¶
astropy.io.ascii¶
- Fix a unicode decode error when reading a table with non-ASCII characters. The fast C reader cannot handle unicode so the code now uses the pure-Python reader in this case. [#7103]
astropy.io.fits¶
- Updated the bundled CFITSIO library to 3.430. This is to remedy a critical
security vulnerability that was identified by NASA. See
cextern/cfitsio/docs/changes.txt
for additional information. [#7274]
astropy.io.misc¶
- Make sure that a sufficiently recent version of ASDF is installed when running test suite against ASDF tags and schemas. [#7205]
astropy.io.registry¶
- Fix reading files with serialized metadata when using a Table subclass. [#7213]
astropy.modeling¶
3.0 (2018-02-12)¶
New Features¶
astropy.constants¶
- New context manager
set_enabled_constants
to temporarily use an older version. [#7008]
astropy.coordinates¶
- The
Distance
object now acceptsparallax
as a keyword in the initializer, and supports retrieving a parallax (as anAngle
) via the.parallax
attributes. [#6855] - The coordinate frame classes (subclasses of
BaseCoordinateFrame
) now always have.velocity
,.proper_motion
, and.radial_velocity
properties that provide shorthands to the full-space Cartesian velocity as aCartesianDifferential
, the 2D proper motion as aQuantity
, and the radial or line-of-sight velocity as aQuantity
. [#6869] SkyCoord
objects now support storing and tranforming differentials - i.e., both radial velocities and proper motions. [#6944]- All frame classes now automatically get sensible representation mappings for
velocity components. For example,
d_x
,d_y
,d_z
are all automatically mapped to frame component namsev_x
,v_y
,v_z
. [#6856] SkyCoord
objects now support updating the position of a source given its space motion and a new time or time difference. [#6872]- The frame classes now accept a representation class or differential class, or
string names for either, through the keyword arguments
representation_type
anddifferential_type
instead ofrepresentation
anddifferential_cls
. [#6873] - The frame classes (and
SkyCoord
) now give more useful error messages when incorrect attribute names are given. Instead of using the representation attribute names, they use the frame attribute names. [#7106] EarthLocation
now has a method to compute the gravitational redshift due due to solar system bodies. [#6861, #6935]EarthLocation
now has aget_gcrs
convenience method to get the location in GCRS coordinates. [#6861, #6935]
astropy.io.fits¶
- Expanded the FITS
Column
interface to accept attributes pertaining to the FITS World Coordinate System, which includes spatial(celestial) and time coordinates. [#6359] - Added
ver
attribute to set theEXTVER
header keyword toImageHDU
andTableHDU
. [#6454] - The performance for reading FITS tables has been significantly improved,
in particular for cases where the tables contain one or more string columns
and when done through
Table.read
. [#6821] - The performance for writing tables from
Table.write
has now been significantly improved for tables containing one or more string columns. [#6920] - The
Table.read
now supports amemmap=
keyword argument to control whether or not to use memory mapping when reading the table. [#6821] - When reading FITS tables with
fits.open
, a new keyword argumentcharacter_as_bytes
can be passed - when set toTrue
, character columns are returned as Numpy byte arrays (Numpy type S) while when set toFalse
, the same columns are decoded to Unicode strings (Numpy type U) which uses more memory. [#6821] - The
table_to_hdu
function and theBinTableHDU.from_columns
andFITS_rec.from_columns
methods now include acharacter_as_bytes
keyword argument - if set toTrue
, then when string columns are accessed, byte columns will be returned, which can provide significantly improved performance. [#6920] - Added support for writing and reading back a table which has “mixin columns”
such as
SkyCoord
orEarthLocation
with no loss of information. [#6912] - Enable tab-completion for
FITS_rec
column names andHeader
keywords with IPython 5 and later. [#7071]
astropy.io.misc¶
- When writing to HDF5 files, the serialized metadata are now saved in a new dataset, instead of the HDF5 dataset attributes. This allows for metadata of any dimensions. [#6304]
- Added support in HDF5 for writing and reading back a table which has “mixin
columns” such as
SkyCoord
orEarthLocation
with no loss of information. [#7007] - Add implementations of astropy-specific ASDF tag types. [#6790]
- Add ASDF tag and schema for ICRSCoord. [#6904]
astropy.modeling¶
- Add unit support for tabular models. [#6529]
- A
deepcopy()
method was added to models. [#6515] - Added units support to
AffineTransformation
. [#6853] - Added
is_separable
function to modeling to test the separability of a model. [#6746] - Added
Model.separable
property. It returns a boolean value orNone
if not set. [#6746] - Support masked array values in
LinearLSQFitter
(instead of silently ignorning the mask). [#6927]
astropy.stats¶
astropy.table¶
- Added support for reading and writing
astropy.time.Time
Table columns to and from FITS tables, to the extent supported by the FITS standard. [#6176] - Improved exception handling and error messages when column
format
attribute is incorrect for the column type. [#6385] - Allow to pass
htmldict
option to the jsviewer writer. [#6551] - Added new table operation
astropy.table.setdiff
that returns the set difference of table rows for two tables. [#6443] - Added support for reading time columns in FITS compliant binary tables
as
astropy.time.Time
Table columns. [#6442] - Allowed to remove table rows through the
__delitem__
method. [#5839] - Added a new
showtable
command-line script to view binary or ASCII table files. [#6859] - Added new table property
astropy.table.Table.loc_indices
that returns the location of rows by indexes. [#6831] - Allow updating of table by indices through the property
astropy.table.Table.loc
. [#6831] - Enable tab-completion for column names with IPython 5 and later. [#7071]
- Allow getting and setting a table Row using multiple column names. [#7107]
astropy.tests¶
- Split pytest plugins into separate modules. Move remotedata, openfiles, doctestplus plugins to standalone repositories. [#6384, #6606]
- When testing, astropy (or the package being tested) is now installed to a temporary directory instead of copying the build. This allows entry points to work correctly. [#6890]
- The tests_require setting in setup.py now works properly when running ‘python setup.py test’. [#6892]
astropy.units¶
- Deprecated conversion of quantities to truth values. Currently, the expression
bool(0 * u.dimensionless_unscaled)
evaluates toTrue
. In the future, attempting to convert aQuantity
to abool
will raiseValueError
. [#6580, #6590] - Modify the
brightness_temperature
equivalency to provide a surface brightness equivalency instead of the awkward assumed-per-beam equivalency that previously existed [#5173, #6663] - Support was added for a number of
scipy.special
functions. [#6852]
astropy.utils¶
- The
astropy.utils.console.ProgressBar.map
class method now supports theipython_widget
option. You can now pass it bothmultiprocess=True
andipython_widget=True
to get both multiprocess speedup and a progress bar widget in an IPython Notebook. [#6368] - The
astropy.utils.compat.funcsigs
module has now been deprecated. Use the Python ‘inspect’ module directly instead. [#6598] - The
astropy.utils.compat.futures
module has now been deprecated. Use the Python ‘concurrent.futures’ module directly instead. [#6598] JsonCustomEncoder
is expanded to handleQuantity
andUnitBase
. [#5471]- Added a
dcip_xy
method to IERS that interpolates along the dX_2000A and dY_2000A columns of the IERS table. Hence, the data for the CIP offsets is now available for use in coordinate frame conversion. [#5837] - The functions
matmul
,broadcast_arrays
,broadcast_to
of theastropy.utils.compat.numpy
module have been deprecated. Use the NumPy functions directly. [#6691] - The
astropy.utils.console.ProgressBar.map
class method now returns results in sequential order. Previously, if you setmultiprocess=True
, then the results could arrive in any arbitrary order, which could be a nasty shock. Although the function will still be evaluated on the items in arbitrary order, the return values will arrive in the same order in which the input items were provided. The method is now a thin wrapper aroundastropy.utils.console.ProgressBar.map_unordered
, which preserves the old behavior. [#6439]
astropy.visualization¶
- Enable Matplotlib’s subtraction shorthand syntax for composing and
inverting trasformations for the
WCSWorld2PixelTransform
andWCSPixel2WorldTransform
classes by settinghas_inverse
toTrue
. In order to implement a unit test, also implement the equality comparison operator for both classes. [#6531] - Added automatic hiding of axes labels when no tick labels are drawn on that
axis. This parameter can be configured with
WCSAxes.coords[*].set_axislabel_visibility_rule
so that labels are automatically hidden when no ticks are drawn or always shown. [#6774]
API Changes¶
astropy.convolution¶
astropy.coordinates¶
- Deprecated
recommended_units
for representations. These were used to ensure that any angle was presented in degrees in sky coordinates and frames. This is more logically done in the frame itself. [#6858] - As noted above, the frame class attributes
representation
anddifferential_cls
are being replaced byrepresentation_type
anddifferential_type
. In the next version, usingrepresentation
will raise a deprecation warning. [#6873] - Coordinate frame classes now can’t be added to the frame transform graph if
they have frame attribute names that conflict with any component names. This
is so
SkyCoord
can uniquely identify and distinguish frame attributes from frame components. [#6871] - Slicing and reshaping of
SkyCoord
and coordinate frames no longer passes the new object through__init__
, but directly sets atttributes on a new instance. This speeds up those methods by an order of magnitude, but means that any customization done in__init__
is by-passed. [#6941]
astropy.io.ascii¶
- Allow ECSV files to be auto-identified by
Table.read
orTable.write
based on the.ecsv
file name suffix. In this case it is not required to provide theformat
keyword. [#6552]
astropy.io.fits¶
astropy.io.misc¶
astropy.io.votable¶
- Add handling of
tree.Group
elements totree.Resource
. Unified I/O or conversion to astropy tables is not affected. [#6262]
astropy.modeling¶
astropy.table¶
- When setting the column
format
attribute the value is now immediately validated. Previously one could set to any value and it was only checked when actually formatting the column. [#6385] - Deprecated the
python3_only
kwarg of theconvert_bytestring_to_unicode
andconvert_unicode_to_bytestring
methods it was needed only for Python2 usage. [#6655] - When reading in FITS tables with
Table.read
, string columns are now represented using Numpy byte (dtypeS
) arrays rather than Numpy unicode arrays (dtypeU
). TheColumn
class then ensures the bytes are automatically converted to string as needed. [#6821] - When getting a table row using multiple column names, if one of the
names is not a valid column name then a
KeyError
exception is now raised (previouslyValueError
). When setting a table row, if the right hand side is not a sequence with the correct length then aValueError
is now raised (previously in certain cases aTypeError
was raised). [#7107]
Bug Fixes¶
astropy.coordinates¶
- Frame objects now use the default differential even if the representation is explicitly provided as long as the representation provided is the same type as the default representation. [#6944]
- Coordinate frame classes now raise an error when they are added to the frame transform graph if they have frame attribute names that conflict with any component names. [#6871]
astropy.io.ascii¶
astropy.io.fits¶
- Properly handle opening of FITS files from
http.client.HTTPResponse
(i.e. it now works correctly when passing the results ofurllib.request.urlopen
tofits.open
). [#6378] - Fix the
fitscheck
script for updating invalid checksums, or removing checksums. [#6571] - Fixed potential problems with the compression module [#6732]
- Always use the ‘D’ format for floating point values in ascii tables. [#6938]
astropy.table¶
- Fix getting a table row when using multiple column names (for example
t[3]['a', 'b', 'c']
). Also fix a problem when setting an entire row: if setting one of the right-hand side values failed this could result in a partial update of the referenced parent table before the exception is raised. [#7107]
astropy.time¶
astropy.utils¶
- The
deprecated
decorator applied to a class will now modify the class itself, rather than to create a class that just looks and behave like the original. This is needed so that the Python 3super
without arguments works for decorated classes. [#6615] - Fixed
HomogeneousList
when setting one item or a slice. [#6773] - Also check the type when creating a new instance of
HomogeneousList
. [#6773] - Make
HomogeneousList
work with iterators and generators when creating the instance, extending it, or using when setting a slice. [#6773]
Other Changes and Additions¶
- Versions of Python <3.5 are no longer supported. [#6556]
- Versions of Pytest <3.1 are no longer supported. [#6419]
- Versions of Numpy <1.10 are no longer supported. [#6593]
- The bundled CFITSIO was updated to version 3.41 [#6477]
analytic_functions
sub-package is removed. Useastropy.modeling.blackbody
. [#6541]astropy.vo
sub-package is removed. Useastropy.samp
for SAMP andastroquery
for VO cone search. [#6540]- The guide to setting up Emacs for code development was simplified, and
updated to recommend
flycheck
andflake8
for syntax checks. [#6692] - The bundled version of PLY was updated to 3.10. [#7174]
2.0.11 (unreleased)¶
Bug Fixes¶
astropy.config¶
astropy.constants¶
astropy.convolution¶
astropy.coordinates¶
astropy.cosmology¶
astropy.extern¶
astropy.io.misc¶
astropy.io.registry¶
astropy.io.votable¶
astropy.modeling¶
astropy.nddata¶
astropy.stats¶
astropy.table¶
astropy.tests¶
astropy.time¶
astropy.units¶
astropy.utils¶
astropy.visualization¶
astropy.vo¶
astropy.wcs¶
Other Changes and Additions¶
2.0.10 (2018-12-04)¶
Bug Fixes¶
astropy.convolution¶
- Fix Moffat2DKernel’s FWHM computation, which has an influence on the default size of the kernel when no size is given. [#8105]
astropy.io.fits¶
fits.append
now correctly handles file objects with valid modes other thanostream
. [#7856]
astropy.tests¶
- Explicitly disallow incompatible versions of
pytest
when using the test runner. [#8188]
astropy.units¶
- Fixed the spelling of the ‘luminous emittance/illuminance’ physical property. [#7942]
astropy.visualization¶
- Fixed a bug that caused origin to be incorrect if not specified. [#7927]
- Fixed a bug that caused an error when plotting grids multiple times with grid_type=’contours’. [#7927]
- Put an upper limit on the number of bins in
hist
andhistogram
and factor out calculation of bin edges into public functioncalculate_bin_edges
. [#7991]
Other Changes and Additions¶
- Fixing
astropy.__citation__
to provide the full bibtex entry of the 2018 paper. [#8110] - Pytest 4.0 is not supported by the 2.0.x LTS releases. [#8173]
- Updating bundled
pytest-remotedata
to v0.3.1. [#8174] - Updating bundled
pytest-doctestplus
to v0.2.0. [#8175] - Updating bundled
pytest-openfiles
to v0.3.0. [#8176] - Adding
warning_type
keyword argument to the “deprecated” decorators to allow issuing custom warning types instead of the defaultAstropyDeprecationWarning
. [#8178]
2.0.9 (2018-10-14)¶
Bug Fixes¶
astropy.io.fits¶
astropy.nddata¶
- Fixed the bug in CCData.read when the HDU is not specified and the first one is empty so the function searches for the first HDU with data which may not have an image extension. [#7739]
astropy.stats¶
- Fixed bugs in biweight statistics functions where a constant data array (or if using the axis keyword, constant along an axis) would return NaN. [#7737]
astropy.table¶
- Fixed a bug in
to_pandas()
where integer type masked columns were always getting converted to float. This could cause loss of precision. Now this only occurs if there are actually masked data values, in which casepandas
does require the values to be float so thatNaN
can be used to mark the masked values. [#7741, #7747]
astropy.tests¶
- Change the name of the configuration variable controlling the location of the
Astropy cache in the Pytest plugin from
cache_dir
toastropy_cache_dir
. The command line flag also changed to--astropy-cache-dir
. This prevents a conflict with thecache_dir
variable provided by pytest itself. Also made similar change toconfig_dir
option as a precaution. [#7721]
astropy.units¶
astropy.visualization¶
astropy.wcs¶
- Instead of raising an error
astropy.wcs
now returns the input when the input has zero size. [#7746] - Fix
malloc(0)
bug inpipeline_all_pixel2world()
andpipeline_pix2foc()
. They now raise an exception for input with zero coordinates, i.e. shape = (0, n). [#7806] - Fixed an issue with scalar input when WCS.naxis is one. [#7858]
2.0.8 (2018-08-02)¶
Bug Fixes¶
astropy.convolution¶
astropy.coordinates¶
- Ensure that relative humidities can be given as Quantities, rather than take any quantity and just strip its unit. [#7668]
astropy.table¶
- Fixed a bug in
add_columns
method whererename_duplicate=True
would cause an error if there were no duplicates. [#7540]
2.0.7 (2018-06-01)¶
Bug Fixes¶
astropy.stats¶
astropy.table¶
- Fix a performance issue in
MaskedColumn
where initialization was extremely slow for large arrays with the defaultmask=None
. [#7422] - Fix printing table row indexed with unsigned integer. [#7469]
- Fix copy of mask when copying a Table, as this is no more done systematically
by Numpy since version 1.14. Also fixed a problem when MaskedColumn was
initialized with
mask=np.ma.nomask
. [#7486]
2.0.6 (2018-04-23)¶
2.0.5 (2018-03-12)¶
Bug Fixes¶
astropy.coordinates¶
astropy.io.fits¶
astropy.tests¶
- Support dotted package names as namespace packages when gathering test coverage. [#7170]
astropy.visualization¶
- Matplotlib axes have the
axisbelow
property to control the z-order of ticks, tick labels, and grid lines. WCSAxes will now respect this property. This is useful for drawing scale bars or inset boxes, which should have a z-order that places them above all ticks and gridlines. [#7098]
2.0.4 (2018-02-06)¶
Bug Fixes¶
astropy.convolution¶
- Fixed IndexError when
preserve_nan=True
inconvolve_fft
. Added testing withpreserve_nan=True
. [#7000]
astropy.coordinates¶
- The
sites.json
file is now parsed explicitly with a UTF-8 encoding. This means that future revisions to the file with unicode observatory names can be done without breaking the site registry parser. [#7082] - Working around a bug in Numpy 1.14.0 that broke some coordinate transformations. [#7105]
- Fixed a bug where negative angles could be rounded wrongly when converting to a string with seconds omitted. [#7148]
astropy.io.fits¶
astropy.io.registry¶
- Fixed bug in identifying inherited registrations from multiple ancestors [#7156]
2.0.3 (2017-12-13)¶
Bug Fixes¶
astropy.coordinates¶
- Ecliptic frame classes now support attributes
v_x
,v_y
,v_z
when using with a Cartesian representation. [#6569] - Added a nicer error message when accidentally calling
frame.representation
instead offrame.data
in the context of methods that use._apply()
. [#6561] - Creating a new
SkyCoord
from a list of multipleSkyCoord
objects now yield the correct type of frame, and works at all for non-equatorial frames. [#6612] - Improved accuracy of velocity calculation in
EarthLocation.get_gcrs_posvel
. [#6699] - Improved accuracy of radial velocity corrections in
SkyCoord.radial_velocity_correction`
. [#6861] - The precision of ecliptic frames is now much better, after removing the nutation from the rotation and fixing the computation of the position of the Sun. [#6508]
astropy.io.fits¶
astropy.io.misc¶
astropy.nddata¶
astropy.stats¶
- Fixed an issue where the biweight statistics functions would sometimes cause runtime underflow/overflow errors for float32 input arrays. [#6905]
astropy.table¶
- Fixed a problem when printing a table when a column is deleted and garbage-collected, and the format function caching mechanism happens to re-use the same cache key. [#6714]
- Fixed a problem when comparing a unicode masked column (on left side) to a bytes masked column (on right side). [#6899]
- Fixed a problem in comparing masked columns in bytes and unicode when the unicode had masked entries. [#6899]
astropy.tests¶
- Fixed a bug that causes tests for rst files to not be run on certain platforms. [#6555, #6608]
- Fixed a bug that caused the doctestplus plugin to not work nicely with the hypothesis package. [#6605, #6609]
- Fixed a bug that meant that the data.astropy.org mirror could not be used when using –remote-data=astropy. [#6724]
- Support compatibility with new
pytest-astropy
plugins. [#6918] - When testing, astropy (or the package being tested) is now installed to a temporary directory instead of copying the build. This allows entry points to work correctly. [#6890]
astropy.time¶
- Initialization of Time instances now is consistent for all formats to
ensure that
-0.5 <= jd2 < 0.5
. [#6653]
astropy.units¶
- Ensure that
Quantity
slices can be set with objects that have aunit
attribute (such asColumn
). [#6123]
astropy.utils¶
download_files_in_parallel
now respects the giventimeout
value. [#6658]- Fixed bugs in remote data handling and also in IERS unit test related to path URL, and URI normalization on Windows. [#6651]
- Fixed a bug that caused
get_pkg_data_fileobj
to not work correctly when used with non-local data from inside packages. [#6724] - Make sure
get_pkg_data_fileobj
fails if the URL can not be read, and correctly falls back on the mirror if necessary. [#6767] - Fix the
finddiff
option infind_current_module
to properly deal with submodules. [#6767] - Fixed
pyreadline
import inutils.console.isatty
for older IPython versions on Windows. [#6800]
2.0.2 (2017-09-08)¶
Bug Fixes¶
astropy.coordinates¶
astropy.table¶
- Fix a bug when combining unicode columns via join or vstack. The character width of the output column was a factor of 4 larger than needed. [#6459]
astropy.tests¶
- Fixed running the test suite using –parallel. [#6415]
- Added error handling for attempting to run tests in parallel without having
the
pytest-xdist
package installed. [#6416] - Fixed issue running doctests with pytest>=3.2. [#6423, #6430]
- Fixed issue caused by antivirus software in response to malformed compressed files used for testing. [#6522]
- Updated top-level config file to properly ignore top-level directories. [#6449]
2.0.1 (2017-07-30)¶
Bug Fixes¶
astropy.constants¶
- Fixed Earth radius to be the IAU2015 value for the equatorial radius. The polar value had erroneously been used in 2.0. [#6400]
astropy.coordinates¶
- Added old frame attribute classes back to top-level namespace of
astropy.coordinates
. [#6357]
astropy.io.fits¶
- Scaling an image always uses user-supplied values when given. Added
defaults for scaling when bscale/bzero are not present (float images).
Fixed a small bug in when to reset
_orig_bscale
. [#5955]
astropy.nddata¶
- Updating CCDData.read() to be more flexible with inputs, don’t try to delete keywords that are missing from the header. [#6388]
astropy.tests¶
- Fixed the test command that is run from
setuptools
to allow it to gracefully handle keyboard interrupts and pass them on to thepytest
subprocess. This promptspytest
to teardown and display useful traceback and test information [#6369]
astropy.visualization¶
- Ticks and tick labels are now drawn in front of, rather than behind, gridlines in WCS axes. This improves legibility in situations where tick labels may be on the interior of the axes frame, such as the right ascension axis of an all-sky Aitoff or Mollweide projection. [#6361]
2.0 (2017-07-07)¶
New Features¶
astropy.constants¶
- Constants are now organized into version modules, with physical CODATA
constants in the
codata2010
andcodata2014
sub-modules, and astronomical constants defined by the IAU in theiau2012
andiau2015
sub-modules. The default constants inastropy.constants
in Astropy 2.0 have been updated fromiau2012
toiau2015
and fromcodata2010
tocodata2014
. The constants for 1.3 can be accessed in theastropyconst13
sub-module and the constants for 2.0 (the default inastropy.constants
) can also be accessed in theastropyconst20
sub-module [#6083] - The GM mass parameters recommended by IAU 2015 Resolution B 3 have been
added as
GM_sun
,GM_jup
, andGM_earth
, for the Sun, Jupiter and the Earth. [#6083]
astropy.convolution¶
- Major change in convolution behavior and keyword arguments. Additional details are in the API section. [#5782]
- Convolution with un-normalized and un-normalizable kernels is now possible. [#5782]
- Add a new argument,
normalization_rtol
, toconvolve_fft
, allowing the user to specify the relative error tolerance in the normalization of the convolution kernel. [#5649, #5177] - Models can now be convoluted using
convolve
orconvolve_fft
, which generates a regular compound model. [#6015]
astropy.coordinates¶
- Frame attributes set on
SkyCoord
are now always validated, and any ndarray-like operation (like slicing) will also be done on those. [#5751] - Caching of all possible frame attributes was implemented. This greatly
speeds up many
SkyCoord
operations. [#5703, #5751] - A class hierarchy was added to allow the representation layer to store differentials (i.e., finite derivatives) of coordinates. This is intended to enable support for velocities in coordinate frames. [#5871]
replicate_without_data
andreplicate
methods were added to coordinate frames that allow copying an existing frame object with various reference or copy behaviors and possibly overriding frame attributes. [#6182]- The representation class instances can now contain differential objects. This is primarily useful for internal operations that will provide support for transforming velocity components in coordinate frames. [#6169]
EarthLocation.to_geodetic()
(andEarthLocation.geodetic
) now return namedtuples instead of regular tuples. [#6237]EarthLocation
now haslat
andlon
properties (equivalent to, but preferred over, the previouslatitude
andlongitude
). [#6237]- Added a
radial_velocity_correction
method toSkyCoord
to do compute barycentric and heliocentric velocity corrections. [#5752] - Added a new
AffineTransform
class for coordinate frame transformations. This class supports matrix operations with vector offsets in position or any differential quantities (so far, only velocity is supported). The matrix transform classes now subclass from the base affine transform. [#6218] - Frame objects now have experimental support for velocity components. Most
frames default to accepting proper motion components and radial velocity,
and the velocities transform correctly for any transformation that uses
one of the
AffineTransform
-type transformations. For other transformations a finite-difference velocity transformation is available, although it is not as numerically stable as those that useAffineTransform
-type transformations. [#6219, #6226]
astropy.io.ascii¶
- Allow to specify encoding in
ascii.read
, only for Python 3 and with the pure-Python readers. [#5448] - Writing latex tables with only a
tabular
environment is now possible by settinglatexdict['tabletyle']
toNone
. [#6205] - Allow ECSV format to support reading and writing mixin columns like
Time
,SkyCoord
,Latitude
, andEarthLocation
. [#6181]
astropy.io.fits¶
- Checking available disk space before writing out file. [#5550, #4065]
- Change behavior to warn about units that are not FITS-compliant when writing a FITS file but not when reading. [#5675]
- Added absolute tolerance parameter when comparing FITS files. [#4729]
- New convenience function
printdiff
to print out diff reports. [#5759] - Allow to instantiate a
BinTableHDU
directly from aTable
object. [#6139]
astropy.modeling¶
- Added
SmoothlyBrokenPowerLaw1D
model. [#5656] - Add
n_submodels
shared method to single and compound models, which allows users to get the number of components of a given single (compound) model. [#5747] - Added a
name
setter for instances of_CompoundModel
. [#5741] - Added FWHM properties to Gaussian and Moffat models. [#6027]
- Added support for evaluating models and setting the results for inputs
outside the bounding_box to a user specified
fill_value
. This is controlled by a new optional boolean keywordwith_bounding_box
. [#6081] - Added infrastructure support for units on parameters and during model evaluation and fitting, added support for units on all functional, power-law, polynomial, and rotation models where this is appropriate. A new BlackBody1D model has been added. [#4855, #6183, #6204, #6235]
astropy.stats¶
- Added
biweight_midcovariance
function. [#5777] - Added
biweight_scale
andbiweight_midcorrelation
functions. [#5991] median_absolute_deviation
andmad_std
haveignore_nan
option that will usenp.ma.median
with nans masked out ornp.nanmedian
instead ofnp.median
when computing the median. [#5232]- Implemented statistical estimators for Ripley’s K Function. [#5712]
- Added
SigmaClip
class. [#6206] - Added
std_ddof
keyword option tosigma_clipped_stats
. [#6066, #6207]
astropy.table¶
- Issue a warning when assigning a string value to a column and the string gets truncated. This can occur because numpy string arrays are fixed-width and silently drop characters which do not fit within the fixed width. [#5624, #5819]
- Added functionality to allow
astropy.units.Quantity
to be written as a normal column to FITS files. [#5910] - Add support for Quantity columns (within a
QTable
) in tablejoin()
,hstack()
andvstack()
operations. [#5841] - Allow unicode strings to be stored in a Table bytestring column in
Python 3 using UTF-8 encoding. Allow comparison and assignment of
Python 3
str
object in a bytestring column (numpy'S'
dtype). If comparison withstr
instead ofbytes
is a problem (andbytes
is really more logical), please open an issue on GitHub. [#5700] - Added functionality to allow
astropy.units.Quantity
to be read from and written to a VOtable file. [#6132] - Added support for reading and writing a table with mixin columns like
Time
,SkyCoord
,Latitude
, andEarthLocation
via the ASCII ECSV format. [#6181] - Bug fix for
MaskedColumn
insert method, wherefill_value
attribute was not being passed along to the copy of theMaskedColumn
that was returned. [#7585]
astropy.tests¶
astropy.units¶
- The
astropy.units.quantity_input
decorator will now convert the output to the unit specified as a return annotation under Python 3. [#5606] - Passing a logarithmic unit to the
Quantity
constructor now returns the appropriate logarithmic quantity class ifsubok=True
. For instance,Quantity(1, u.dex(u.m), subok=True)
yields<Dex 1.0 dex(m)>
. [#5928] - The
quantity_input
decorator now accepts a string physical type in addition to of a unit object to specify the expected inputQuantity
’s physical type. For example,@u.quantity_input(x='angle')
is now functionally the same as@u.quantity_input(x=u.degree)
. [#3847] - The
quantity_input
decorator now also supports unit checking for optional keyword arguments and accepts iterables of units or physical types for specifying multiple valid equivalent inputs. For example,@u.quantity_input(x=['angle', 'angular speed'])
or@u.quantity_input(x=[u.radian, u.radian/u.yr])
would both allow either aQuantity
angle or angular speed passed in to the argumentx
. [#5653] - Added a new equivalence
molar_mass_amu
between g/mol to atomic mass units. [#6040, #6113] Quantity
has gained a newto_value
method which returns the value of the quantity in a given unit. [#6127]Quantity
now supports the@
operator for matrix multiplication that was introduced in Python 3.5, for all supported versions of numpy. [#6144]Quantity
supports the new__array_ufunc__
protocol introduced in numpy 1.13. As a result, operations that involve unit conversion will be sped up considerably (by up to a factor of two for costly operations such as trigonometric ones). [#2583]
astropy.utils¶
API Changes¶
astropy.analytic_functions¶
- This entire sub-package is deprecated because blackbody has been moved to
astropy.modeling.blackbody
. [#6191]
astropy.convolution¶
- Major change in convolution behavior and keyword arguments.
astropy.convolution.convolve_fft
replacedinterpolate_nan
withnan_treatment
, andastropy.convolution.convolve
received a newnan_treatment
argument.astropy.convolution.convolve
also no longer double-interpolates interpolates over NaNs, although that is now available as a separateastropy.convolution.interpolate_replace_nans
function. See the backwards compatibility note for more on how to get the old behavior (and why you probably don’t want to.) [#5782]
astropy.coordinates¶
- The
astropy.coordinates.Galactic
frame previously was had the cartesian ordering ‘w’, ‘u’, ‘v’ (for ‘x’, ‘y’, and ‘z’, respectively). This was an error and against the common convention. The ‘x’, ‘y’, and ‘z’ axes now map to ‘u’, ‘v’, and ‘w’, following the right-handed (‘u’ points to the Galactic center) convention. [#6330] - Removed deprecated
angles.rotation_matrix
andangles.angle_axis
. Use the routines incoordinates.matrix_utilities
instead. [#6170] EarthLocation.latitude
andEarthLocation.longitude
are now deprecated in favor ofEarthLocation.lat
andEarthLocation.lon
. They former will be removed in a future version. [#6237]- The
FrameAttribute
class and subclasses have been renamed to just containAttribute
. For example,QuantityFrameAttribute
is nowQuantityAttribute
. [#6300]
astropy.cosmology¶
- Cosmological models do not include any contribution from neutrinos or photons by default – that is, the default value of Tcmb0 is 0. This does not affect built in models (such as WMAP or Planck). [#6112]
astropy.io.fits¶
- Remove deprecated
NumCode
andImgCode
properties on FITS_ImageBaseHDU
. Use module-level constantsBITPIX2DTYPE
andDTYPE2BITPIX
instead. [#4993] comments
meta key (which isio.ascii
’s table convention) is output toCOMMENT
instead ofCOMMENTS
header. Similarly,COMMENT
headers are read intocomments
meta [#6097]- Remove compatibility code which forced loading all HDUs on close. The old
behavior can be used with
lazy_load_hdus=False
. Because of this change, trying to access the.data
attribute from an HDU which is not loaded now raises aIndexError
instead of aValueError
. [#6082] - Deprecated
clobber
keyword; useoverwrite
. [#6203] - Add EXTVER column to the output of
HDUList.info()
. [#6124]
astropy.modeling¶
- Removed deprecated
Redshift
model; UseRedshiftScaleFactor
. [#6053] - Removed deprecated
Pix2Sky_AZP.check_mu
andPix2Sky_SZP.check_mu
methods. [#6170] - Deprecated
GaussianAbsorption1D
model, as it can be better represented by subtractingGaussian1D
fromConst1D
. [#6200] - Added method
sum_of_implicit_terms
toModel
, needed when performing a linear fit to a model that has built-in terms with no corresponding parameters (primarily the1*x
term ofShift
). [#6174]
astropy.nddata¶
astropy.stats¶
astropy.table¶
- In Python 3, when getting an item from a bytestring Column it is now
converted to
str
. This means comparing a single item to abytes
object will always fail, and instead one must compare with astr
object. [#5700] - Removed the deprecated
data
property of Row. [#5729] - Removed the deprecated functions
join
,hstack
,vstack
andget_groups
from np_utils. [#5729] - Added
name
parameter to methodastropy.table.Table.add_column
andnames
parameter to methodastropy.table.Table.add_columns
, to provide the flexibility to add unnamed columns, mixin objects and also to specify explicit names. Default names will be used if not specified. [#5996] - Added optional
axis
parameter toinsert
method forColumn
andMaskedColumn
classes. [#6092]
astropy.units¶
- Moved
units.cgs.emu
tounits.deprecated.emu
due to ambiguous definition of “emu”. [#4918, #5906] jupiterMass
,earthMass
,jupiterRad
, andearthRad
no longer have their prefixed units included in the standard units. If needed, they can still be found inunits.deprecated
. [#5661]solLum
,``solMass``, andsolRad
no longer have their prefixed units included in the standard units. If needed, they can still be found inunits.required_by_vounit
, and are enabled by default. [#5661]- Removed deprecated
Unit.get_converter
. [#6170] - Internally, astropy replaced use of
.to(unit).value
with the newto_value(unit)
method, since this is somewhat faster. Any subclasses that overwrote.to
, should also overwrite.to_value
(or possibly just the private._to_value
method. (If you did this, please let us know what was lacking that made this necessary!). [#6137]
astropy.utils¶
astropy.vo¶
Bug Fixes¶
astropy.convolution¶
- Major change in convolution behavior and keyword arguments:
astropy.convolution.convolve
was not performing normalized convolution in earlier versions of astropy. [#5782] - Direct convolution previously implemented the wrong definition of convolution. This error only affects asymmetric kernels. [#6267]
astropy.coordinates¶
- The
astropy.coordinates.Galactic
frame had an incorrect ording for the ‘u’, ‘v’, and ‘w’ cartesian coordinates. [#6330] - The
astropy.coordinates.search_around_sky
,astropy.coordinates.search_around_3d
, andSkyCoord
equivalent methods now correctly yield anastropy.coordinates.Angle
as the third return type even if there are no matches (previously it returned a raw Quantity). [#6347]
astropy.cosmology¶
astropy.extern¶
astropy.io.ascii¶
astropy.io.fits¶
comments
meta key (which isio.ascii
’s table convention) is output toCOMMENT
instead ofCOMMENTS
header. Similarly,COMMENT
headers are read intocomments
meta [#6097]- Use more sensible fix values for invalid NAXISj header values. [#5935]
- Close file on error to avoid creating a
ResourceWarning
warning about an unclosed file. [#6168, #6177]
astropy.modeling¶
- Creating a compound model where one of the submodels is a compound model whose parameters were changed now uses the updated parameters and not the parameters of the original model. [#5741]
- Allow
Mapping
andIdentity
to be fittable. [#6018] - Gaussian models now impose positive
stddev
in fitting. [#6019] - OrthoPolynomialBase (Chebyshev2D / Legendre2D) models were being evaluated incorrectly when part of a compound model (using the parameters from the original model), which in turn caused fitting to fail as a no-op. [#6085]
- Allow
Ring2D
to be defined usingr_out
. [#6192] - Make
LinearLSQFitter
produce correct results with fixed model parameters and allowShift
andScale
to be fitted withLinearLSQFitter
andLevMarLSQFitter
. [#6174]
astropy.stats¶
astropy.table¶
astropy.time¶
- Fixed the initial condition of
TimeFITS
to allow scale, FITS scale and FITS realization to be checked and equated properly. [#6202]
Other Changes and Additions¶
- Numpy 1.7 and 1.8 are no longer supported. [#6006]
- Python 3.3 is no longer suppored. [#6020]
- The bundled ERFA was updated to version 1.4.0. [#6239]
- The bundled version of pytest has now been removed, but the astropy.tests.helper.pytest import will continue to work properly. Affiliated packages should nevertheless transition to importing pytest directly rather than from astropy.tests.helper. This also means that pytest is now a formal requirement for testing for both Astropy and for affiliated packages. [#5694]
1.3.3 (2017-05-29)¶
Bug Fixes¶
astropy.coordinates¶
- Fixed a bug where
StaticMatrixTransform
erroneously copied frame attributes from the input coordinate to the output frame. In practice, this didn’t actually affect any transforms in Astropy but may change behavior for users who explicitly used theStaticMatrixTransform
in their own code. [#6045] - Fixed
get_icrs_coordinates
to loop through all the urls in case one raises an exception. [#5864]
astropy.io.fits¶
- Fix table header not written out properly when
fits.writeto()
convenience function is used. [#6042] - Fix writing out read-only arrays. [#6036]
- Extension headers are written out properly when the
fits.update()
convenience function is used. [#6058] - Angstrom, erg, G, and barn are no more reported as deprecated FITS units. [#5929]
astropy.table¶
- Fix problem with Table pprint/pformat raising an exception for non-UTF-8 compliant bytestring data. [#6117]
astropy.units¶
astropy.utils¶
astropy.visualization¶
- Fix bug in ManualInterval which caused the limits to be returned incorrectly if set to zero, and fix defaults for ManualInterval in the presence of NaNs. [#6088]
- Get rid of warnings that occurred when slicing a cube due to the tick locator trying to find ticks for the sliced axis. [#6104]
- Accept normal Matplotlib keyword arguments in set_xlabel and set_ylabel functions. [#5686, #5692, #6060]
- Fix a bug that caused labels to be missing from frames with labels that could change direction mid-axis, such as EllipticalFrame. Also ensure that empty tick labels do not cause any warnings. [#6063]
1.3.1 (2017-03-18)¶
New Features¶
Bug Fixes¶
astropy.coordinates¶
- Changed
SkyCoord
so that frame attributes which are not valid for the currentframe
(but are valid for other frames) are stored on theSkyCoord
instance instead of the underlyingframe
instance (e.g., settingrelative_humidity
on an ICRSSkyCoord
instance.) [#5750] - Ensured that
position_angle
andseparation
give correct answers for frames with different equinox (see #5722). [#5762]
astropy.io.fits¶
- Fix problem with padding bytes written for BinTable columns converted from unicode [#5280, #5287, #5288, #5296].
- Fix out-of-order TUNITn cards when writing tables to FITS. [#5720]
- Recognize PrimaryHDU when non boolean values are present for the ‘GROUPS’ header keyword. [#5808]
- Fix the insertion of new keywords in compressed image headers
(
CompImageHeader
). [#5866]
astropy.modeling¶
- Fixed a problem with setting
bounding_box
on 1D models. [#5718] - Fixed a broadcasting problem with weighted fitting of 2D models
with
LevMarLSQFitter
. [#5788] - Fixed a problem with passing kwargs to fitters, specifically
verblevel
. [#5815] - Changed FittingWithOutlierRemoval to reject on the residual to the fit [#5831]
astropy.stats¶
astropy.table¶
- Fix problem where key for caching column format function was not sufficiently unique. [#5803]
- Handle sorting NaNs and masked values in jsviewer. [#4052, #5572]
- Ensure mixin columns can be added to a table using a scalar value for the
right-hand side if the type supports broadcasting. E.g., for an existing
QTable
,t['q'] = 3*u.m
will now add a column as expected. [#5820] - Fixes the bug of setting/getting values from rows/columns of a table using numpy array scalars. [#5772]
astropy.utils¶
- Avoid importing
ipython
inutils.console
until it is necessary, to prevent deprecation warnings when importing, e.g.,Column
. [#5755]
astropy.visualization¶
- Avoid importing matplotlib.pyplot when importing astropy.visualization.wcsaxes. [#5680, #5684]
- Ignore Numpy warnings that happen in coordinate transforms in WCSAxes. [#5792]
- Fix compatibility issues between WCSAxes and Matplotlib 2.x. [#5786]
- Fix a bug that caused WCSAxes frame visual properties to not be copied over when resetting the WCS. [#5791]
Other Changes and Additions¶
- Fixed a deprecation warning that occurred when running tests with astropy.test(). [#5689]
- The deprecation of the
clobber
argument (originally deprecated in 1.3.0) in theio.fits
write functions was changed to a “pending” deprecation (without displaying warnings) for now. [#5761] - Updated bundled astropy-helpers to v1.3.1. [#5880]
1.3 (2016-12-22)¶
New Features¶
astropy.convolution¶
- The
convolve
andconvolve_fft
arguments now support amask
keyword, which allows them to also supportNDData
objects as inputs. [#5554]
astropy.coordinates¶
- Added an
of_address
classmethod toEarthLocation
to enable fast creation ofEarthLocation
objects given an address by querying the Google maps API [#5154]. - A new routine,
get_body_barycentric_posvel
has been added that allows one to calculate positions as well as velocities for solar system bodies. For JPL kernels, this roughly doubles the execution time, so if one requires only the positions, one should useget_body_barycentric
. [#5231] - Transformations between coordinate systems can use the more accurate JPL ephemerides. [#5273, #5436]
- Arithmetic on representations, such as addition of two representations,
multiplication with a
Quantity
, or calculating the norm viaabs
, has now become possible. Furthermore, there are new methodsmean
,sum
,dot
, andcross
. For all these, the representations are treated as vectors in cartesian space (temporarily converting toCartesianRepresentation
if necessary). [#5301] has now become possible. Furthermore, there are news methodsmean
,sum
,dot
, andcross
with obvious meaning. [#5301] multiplication with aQuantity
has now become possible. Furthermore, there are new methodsnorm
,mean
,sum
,dot
, andcross
. In all operations, the representations are treated as vectors. They are temporarily converted toCartesianRepresentation
if necessary. [#5301] CartesianRepresentation
can be initialized with plain arrays by passing in aunit
. Furthermore, for input with a vector array, the coordinates no longer have to be in the first dimension, but can be at anyxyz_axis
. To complement the latter, a newget_xyz(xyz_axis)
method allows one to get a vector array out along a given axis. [#5439]
astropy.io.ascii¶
- Files with “Fortran-style” columns (i.e. double-precision scientific notation
with a character other than “e”, like
1.495978707D+13
) can now be parsed by the fast reader natively. [#5552] - Allow round-tripping masked data tables in most formats by using an
empty string
''
as the default representation of masked values when writing. [#5347] - Allow reading HTML tables with unicode column values in Python 2.7. [#5410]
- Check for self-consistency of ECSV header column names. [#5463]
- Produce warnings when writing an IPAC table from an astropy table that contains metadata not supported by the IPAC format. [#4700]
astropy.io.fits¶
- “Lazy” loading of HDUs now occurs - when an HDU is requested, the file is only read up to the point where that HDU is found. This can mean a substantial speedup when accessing files that have many HDUs. [#5065]
astropy.io.misc¶
- Added
io.misc.yaml
module to support serializing core astropy objects using the YAML protocol. [#5486]
astropy.io.registry¶
- Added
delay_doc_updates
contextmanager to postpone the formatting of the documentation for theread
andwrite
methods of the class to optionally reduce the import time. [#5275]
astropy.modeling¶
- Added a class to combine astropy fitters and functions to remove outliers e. g., sigma clip. [#4760]
- Added a
Tabular
model. [#5105] - Added
Hermite1D
andHermite2D
polynomial models [#5242] - Added the injection of EntryPoints into astropy.modeling.fitting if they inherit from Fitters class. [#5241]
- Added bounding box to
Lorentz1D
andMexicanHat1D
models. [#5393] - Added
Planar2D
functional model. [#5456] - Updated
Gaussian2D
to accept no arguments (will use default x/y_stddev and theta). [#5537]
astropy.table¶
astropy.tests¶
astropy.units¶
astropy.utils¶
- Added a new decorator:
deprecated_renamed_argument
. This can be used to rename a function argument, while it still allows for the use of the older argument name. [#5214]
astropy.visualization¶
- Added a
make_lupton_rgb
function to generate color images from three greyscale images, following the algorithm of Lupton et al. (2004). [#5535] - Added
data
andinterval
inputs to theImageNormalize
class. [#5206] - Added a new
simple_norm
convenience function. [#5206] - Added a default stretch for the
Normalization
class. [#5206]. - Added a default
vmin/vmax
for theManualInterval
class. [#5206]. - The
wcsaxes
subpackage has now been integrated in astropy asastropy.visualization.wcsaxes
. This allows plotting of astronomical data/coordinate systems in Matplotlib. [#5496]
API Changes¶
astropy.convolution¶
discretize_model
now raises an exception if non-integer ranges are used. Previously it had incorrect behavior but did not raise an exception. [#5538]
astropy.coordinates¶
SkyCoord
,ICRS
, and other coordinate objects, as well as the underlying representations such asSphericalRepresentation
andCartesianRepresentation
can now be reshaped using methods named like the numpy ones forndarray
(reshape
,swapaxes
, etc.) [#4123, #5254, #5482]- The
obsgeoloc
andobsgeovel
attributes ofGCRS
andPrecessedGeocentric
frames are now stored and returned asCartesianRepresentation
objects, rather thanQuantity
objects. Similarly,EarthLocation.get_gcrs_posvel
now returns a tuple ofCartesianRepresentation
objects. [#5253] search_around_3d
andsearch_around_sky
now return units for the distance matching their input argument when no match is found, instead ofdimensionless_unscaled
. [#5528]
astropy.io.ascii¶
- ASCII writers now accept an ‘overwrite’ argument.
The default behavior is changed so that a warning will be
issued when overwriting an existing file unless
overwrite=True
. In a future version this will be changed from a warning to an exception to prevent accidentally overwriting a file. [#5007] - The default representation of masked values when writing tables was
changed from
'--'
to the empty string''
. Previously any user-suppliedfill_values
parameter would overwrite the class default, but now the values are prepended to the class default. [#5347]
astropy.io.fits¶
- The old
Header
interface, deprecated since Astropy 0.1 (PyFITS 3.1), has been removed entirely. See Header Interface Transition Guide for explanations on this change and help on the transition. [#5310] - The following functions, classes and methods have been removed:
CardList
,Card.key
,Card.cardimage
,Card.ascardimage
,create_card
,create_card_from_string
,upper_key
,Header.ascard
,Header.rename_key
,Header.get_history
,Header.get_comment
,Header.toTxtFile
,Header.fromTxtFile
,new_table
,tdump
,tcreate
,BinTableHDU.tdump
,BinTableHDU.tcreate
. - Removed
txtfile
argument to theHeader
constructor. - Removed usage of
Header.update
withHeader.update(keyword, value, comment)
arguments. - Removed
startColumn
andendColumn
arguments to theFITS_record
constructor. - The
clobber
argument in FITS writers has been renamed tooverwrite
. This change affects the following functions and methods:tabledump
,writeto
,Header.tofile
,Header.totextfile
,_BaseDiff.report
,_BaseHDU.overwrite
,BinTableHDU.dump
andHDUList.writeto
. [#5171] - Added an optional
copy
parameter tofits.Header
which controls if a copy is made when creating anHeader
from anotherHeader
. [#5005, #5326]
astropy.io.registry¶
astropy.modeling¶
Gaussian2D
now raises an error iftheta
is set at the same time ascov_matrix
(previouslytheta
was silently ignored). [#5537]
astropy.table¶
- Setting an existing table column (e.g.
t['a'] = [1, 2, 3]
) now defaults to replacing the column with a column corresponding to the new value (usingt.replace_column()
) instead of doing an in-place update. Any existing meta-data in the column (e.g. the unit) is discarded. An in-place update is still done when the new value is not a valid column, e.g.t['a'] = 0
. To force an in-place update use the patternt['a'][:] = [1, 2, 3]
. [#5556] - Allow
collections.Mapping
-likedata
attribute when initializing aTable
object (dict
-like was already possible). [#5213]
astropy.tests¶
- The inputs to the
TestRunner.run_tests()
method now must be keyword arguments (no positional arguments). This applies to theastropy.test()
function as well. [#5505]
astropy.utils¶
- Renamed
ignored
context manager incompat.misc
tosuppress
to be consistent with https://bugs.python.org/issue19266 . [#5003]
astropy.visualization¶
Bug Fixes¶
astropy.coordinates¶
- Transformations between CIRS and AltAz now correctly account for the location of the observer. [#5591]
- GCRS frames representing a location on Earth with multiple obstimes are now
allowed. This means that the solar system routines
get_body
,get_moon
andget_sun
now work with non-scalar times and a non-geocentric observer. [#5253]
astropy.io.fits¶
- Copying a
fits.Header
usingcopy
ordeepcopy
from thecopy
module will useHeader.copy
to ensure that modifying the copy will not alter the other original Header and vice-versa. [#4990, #5323] HDUList.info()
no longer raisesAttributeError
in presence ofBZERO
. [#5508]- Avoid exceptions with numpy 1.10 and up when using scaled integer data
where
BZERO
has float type but integer value. [#4639, #5527] - Converting a header card to a string now calls
self.verify('fix+warn')
instead ofself.verify('fix')
so headers with invalid keywords will not raise aVerifyError
on printing. [#887,#5054] FITS_Record._convert_ascii
now converts blank fields to 0 when a non-blank null column value is set. [#5134, #5394]
astropy.io.registry¶
read
now correctly raises an IOError if a file with an unknown extension can’t be found, instead of raising IORegistryError: “Format could not be identified.” [#4779]
astropy.time¶
- Ensure
Time
instances holding a singledelta_ut1_utc
can be copied, flattened, etc. [#5225]
astropy.units¶
- Operations involving
Angle
orDistance
, or any otherSpecificTypeQuantity
instance, now also keep return an instance of the same type if the instance was the second argument (if the resulting unit is consistent with the specific type). [#5327] - Inplace operations on
Angle
andDistance
instances now raise an exception if the final unit is not equivalent to radian and meter, resp. Similarly, views asAngle
andDistance
can now only be taken from quantities with appropriate units, and views asQuantity
can only be taken from logarithmic quanties such asMagnitude
if the physical unit is dimensionless. [#5070] - Conversion from quantities to logarithmic units now correctly causes a
logarithmic quantity such as
Magnitude
to be returned. [#5183]
Other Changes and Additions¶
- The bundled ERFA was updated to version 1.3.0. This includes the leap second planned for 2016 Dec 31.
astropy.coordinates¶
- Initialization of
Angle
has been sped up forQuantity
andAngle
input. [#4970] - The use of
np.matrix
instances in the transformations has been deprecated, since this class does not allow stacks of matrices. As a result, the semi-public functionsangles.rotation_matrix
andangles.angle_axis
are also deprecated, in favour of the new routines with the same name incoordinates.matrix_utilities
. [#5104] - A new
BaseCoordinateFrame.cache
dictionary has been created to expose the internal cache. This is useful when modifying representation data in-place without usingrealize_frame
. Additionally, documentation for in-place operations on coordinates were added. [#5575] - Coordinates and their representations are printed with a slightly different format, following how numpy >= 1.12 prints structured arrays. [#5423]
astropy.cosmology¶
- The default cosmological model has been changed to Planck 2015, and the citation strings have been updated. [#5372]
astropy.extern¶
astropy.io.fits¶
astropy.io.registry¶
- Reduced the time spent in the
get_formats
function. This also reduces the time it takes to import astropy subpackages, i.e.astropy.coordinates
. [#5262]
astropy.units¶
- The functions
add_enabled_units
,set_enabled_equivalencies
andadd_enabled_equivalencies
have been sped up by copying the current_UnitRegistry
instead of building it from scratch. [#5306] - To build the documentation, the
build_sphinx
command has been deprecated in favor ofbuild_docs
. [#5179] - The
--remote-data
option topython setup.py test
can now take different arguments:--remote-data=none
is the same as not specifying--remote-data
(skip all tests that require the internet),--remote-data=astropy
skips all tests that need remote data except those that require only data from data.astropy.org, and--remote-data=any
is the same as--remote-data
(run all tests that use remote data). [#5506] - The pytest
recwarn
fixture has been removed from the tests in favor ofutils.catch_warnings
. [#5489] - Deprecated escape sequences in strings (Python 3.6) have been removed. [#5489]
1.2.2 (2016-12-22)¶
Bug Fixes¶
astropy.io.ascii¶
- Fix a bug where the
fill_values
parameter was ignored when writing a table to HTML format. [#5379]
astropy.io.fits¶
- Handle unicode FITS BinTable column names on Python 2 [#5204, #4805]
- Fix reading of float values from ASCII tables, that could be read as float32 instead of float64 (with the E and F formats). These values are now always read as float64. [#5362]
- Fixed memoryleak when using the compression module. [#5399, #5464]
- Able to insert and remove lower case HIERARCH keywords in a consistent manner [#5313, #5321]
astropy.table¶
astropy.units¶
1.2.1 (2016-06-22)¶
Bug Fixes¶
astropy.io.fits¶
astropy.units¶
- Fixed an
ImportError
that occurred wheneverastropy.constants
was imported beforeastropy.units
. [#5030, #5121] - Magnitude zero points used to define
STmag
,ABmag
,M_bol
andm_bol
are now collected inastropy.units.magnitude_zero_points
. They are not enabled as regular units by default, but can be included usingastropy.units.magnitude_zero_points.enable()
. This makes it possible to round-trip magnitudes as originally intended. [#5030]
1.2 (2016-06-19)¶
New Features¶
astropy.constants¶
- Add
L_bol0
, the luminosity corresponding to absolute bolometric magnitude zero. [#4262]
astropy.coordinates¶
CartesianRepresentation
now includes a transform() method that can take a 3x3 matrix to transform coordinates. [#4860]- Solar system and lunar ephemerides accessible via
get_body
,get_body_barycentric
andget_moon
functions. [#4890] - Added astrometric frames (i.e., a frame centered on a particular point/object specified in another frame). [#4909, #4941]
- Added
SkyCoord.spherical_offsets_to
method. [#4338] - Recent Earth rotation (IERS) data are now auto-downloaded so that AltAz transformations for future dates now use the most accurate available rotation values. [#4436]
- Add support for heliocentric coordinate frames. [#4314]
astropy.cosmology¶
astropy.io.ascii¶
- File name could be passed as
Path
object. [#4606] - Check that columns in
formats
specifier exist in the output table when writing. [#4508, #4511] - Allow trailing whitespace in the IPAC header lines. [#4758]
- Updated to filter out the default parser warning of BeautifulSoup. [#4551]
- Added support for reading and writing reStructuredText simple tables. [#4812]
astropy.io.fits¶
- File name could be passed as
Path
object. [#4606] - Header allows a dictionary-like cards argument during creation. [#4663]
- New function
convenience.table_to_hdu
to allow creating a FITS HDU object directly from an astropyTable
. [#4778] - New optional arguments
ignore_missing
andremove_all
are added toastropy.io.fits.header.remove()
. [#5020]
astropy.modeling¶
astropy.nddata¶
UnknownUncertainty
new subclass ofNDUncertainty
that can be used to save uncertainties that cannot be used for error propagation. [#4272]NDArithmeticMixin
:add
,subtract
,multiply
anddivide
can be used as classmethods but require that two operands are given. These operands don’t need to be NDData instances but they must be convertible to NDData. This conversion is done internally. Using it on the instance does not require (but also allows) two operands. [#4272, #4851]NDDataRef
new subclass that implementsNDData
together with all currently available mixins. This class does not implement additional attributes, methods or a numpy.ndarray-like interface likeNDDataArray
. attributes, methods or a numpy.ndarray-like interface likeNDDataArray
. [#4797]
astropy.stats¶
- Added
axis
keyword formad_std
function. [#4688, #4689] - Added Bayesian and Akaike Information Criteria. [#4716]
- Added Bayesian upper limits for Poisson count rates. [#4622]
- Added
circstats
; a module for computing circular statistics. [#3705, #4472] - Added
jackknife
resampling method. [#3708, #4439] - Updated
bootstrap
to allow bootstrapping statistics with multiple outputs. [#3601] - Added
LombScargle
class to compute Lomb-Scargle periodograms [#4811]
astropy.table¶
Table.show_in_notebook
andTable.show_in_browser(jsviewer=True)
now yield tables with an “idx” column, allowing easy identification of the index of a row even when the table is re-sorted in the browser. [#4404]- Added
AttributeError
when trying to set mask on non-masked table. [#4637] - Allow to use a tuple of keys in
Table.sort
. [#4671] - Added
itercols
; a way to iterate through columns of a table. [#3805, #4888] Table.show_in_notebook
and the default notebook display (i.e.,Table._repr_html_
) now use consistent table styles which can be set using theastropy.table.default_notebook_table_class
configuration item. [#4886]- Added interface to create
Table
directly from any table-like object that has an__astropy_table__
method. [#4885]
astropy.tests¶
- Enable test runner to obtain documentation source files from directory other than “docs”. [#4748]
astropy.time¶
astropy.units¶
- The option to use tuples to indicate fractional powers of units, deprecated in 0.3.1, has been removed. [#4449]
- Added slug to imperial units. [#4670]
- Added Earth radius (
R_earth
) and Jupiter radius (R_jup
) to units. [#4818] - Added a
represents
property to allow access to the definition of a named unit (e.g.,u.kpc.represents
yields1000 pc
). [#4806] - Add bolometric absolute and apparent magnitudes,
M_bol
andm_bol
. [#4262]
astropy.utils¶
Path
object could be passed toget_readable_fileobj
. [#4606]- Implemented a generic and extensible way of merging metadata. [#4459]
- Added
format_doc
decorator which allows to replace and/or format the current docstring of an object. [#4242] - Added a new context manager
set_locale
to temporarily set the current locale. [#4363] - Added new IERS_Auto class to auto-download recent IERS (Earth rotation) data when required by coordinate or time transformations. [#4436]
API changes¶
astropy.config¶
astropy.coordinates¶
astropy.io.fits¶
- Two optional boolean arguments
ignore_missing
andremove_all
are added toHeader.remove
. [#5020]
astropy.modeling¶
astropy.nddata¶
NDDataBase
does not set the private uncertainty property anymore. This only affects you if you subclassNDDataBase
directly. [#4270]NDDataBase
: theuncertainty
-setter is removed. A similar one is added inNDData
so this also only affects you if you subclassedNDDataBase
directly. [#4270]NDDataBase
:uncertainty
-getter returnsNone
instead of the private uncertainty and is now abstract. This getter is moved toNDData
so it only affects direct subclasses ofNDDataBase
. [#4270]NDData
accepts a Quantity-like data and an explicitly given unit. Before a ValueError was raised in this case. The final instance will use the explicitly given unit-attribute but doesn’t check if the units are convertible and the data will not be scaled. [#4270]NDData
: the given mask, explicit or implicit if the data was masked, will be saved by the setter. It will not be saved directly as the private attribute. [#4879]NDData
accepts an additional argumentcopy
which will copy every parameter before it is saved as attribute of the instance. [#4270]NDData
: added anuncertainty.getter
that returns the private attribute. It is equivalent to the oldNDDataBase.uncertainty
-getter. [#4270]NDData
: added anuncertainty.setter
. It is slightly modified with respect to the oldNDDataBase.uncertainty
-setter. The changes include:- if the uncertainty has no uncertainty_type an info message is printed
instead of a TypeError and the uncertainty is saved as
UnknownUncertainty
except the uncertainty is None. [#4270] - the requirement that the uncertainty_type of the uncertainty needs to be a string was removed. [#4270]
- if the uncertainty is a subclass of NDUncertainty the parent_nddata attribute will be set so the uncertainty knows to which data it belongs. This is also a Bugfix. [#4152, #4270]
NDData
: added ameta
-getter, which will set and return an empty OrderedDict if no meta was previously set. [#4509, #4469]NDData
: added anmeta
-setter. It requires that the meta is dictionary-like (it also accepts Headers or ordered dictionaries and others) or None. [#4509, #4469, #4921]NDArithmeticMixin
: The operand in arithmetic methods (add
, …) doesn’t need to be a subclass ofNDData
. It is sufficient if it can be converted to one. This conversion is done internally. [#4272]NDArithmeticMixin
: The arithmetic methods allow several new arguments to control how or if different attributes of the class will be processed during the operation. [#4272]NDArithmeticMixin
: Giving the parameterpropagate_uncertainties
as positional keyword is deprecated and will be removed in the future. You now need to specify it as keyword-parameter. BesidesTrue
andFalse
alsoNone
is now a valid value for this parameter. [#4272, #4851]NDArithmeticMixin
: The wcs attribute of the operands is not compared and thus raises no ValueError if they differ, except if acompare_wcs
parameter is specified. [#4272]NDArithmeticMixin
: The arithmetic operation was split from a general_arithmetic
method to different specialized private methods to allow subclasses more control on how the attributes are processed without overriding_arithmetic
. The_arithmetic
method is now used to call these other methods. [#4272]NDSlicingMixin
: If the attempt at slicing the mask, wcs or uncertainty fails with aTypeError
a Warning is issued instead of the TypeError. [#4271]NDUncertainty
:support_correlated
attribute is deprecated in favor ofsupports_correlated
which is a property. Also affectsStdDevUncertainty
. [#4272]NDUncertainty
: added the__init__
that was previously implemented inStdDevUncertainty
and takes an additionalunit
parameter. [#4272]NDUncertainty
: added aunit
property without setter that returns the set unit or if not set the unit of the parent. [#4272]NDUncertainty
: included aparent_nddata
property similar to the one previously implemented in StdDevUncertainty. [#4272]NDUncertainty
: added anarray
property with setter. The setter will convert the value to a plain numpy array if it is a list or a subclass of a numpy array. [#4272]NDUncertainty
:propagate_multiply
and similar were removed. Before they were abstract properties and replaced by methods with the same name but with a leading underscore. The entry point for propagation is a method calledpropagate
. [#4272]NDUncertainty
and subclasses: implement a representation (__repr__
). [#4787]StdDevUncertainty
: error propagation allows an explicitly given correlation factor, which may be a scalar or an array which will be taken into account during propagation. This correlation must be determined manually and is not done by the uncertainty! [#4272]StdDevUncertainty
: thearray
is converted to a plain numpy array only if it’s a list or a subclass of numpy.ndarray. Previously it was always cast to a numpy array but also allowed subclasses. [#4272]StdDevUncertainty
: setting theparent_nddata
does not compare if the shape of it’s array is identical to the parents data shape. [#4272]StdDevUncertainty
: thearray.setter
doesn’t compare if the array has the same shape as the parents data. [#4272]StdDevUncertainty
: deprecatedsupport_correlated
in favor ofsupports_correlated
. [#4272, #4828]StdDevUncertainty
: deprecatedpropagate_add
and similar methods in favor ofpropagate
. [#4272, #4828]- Allow
data
to be a named argument inNDDataArray
. [#4626]
astropy.table¶
operations.unique
now has akeep
parameter, which allows one to select whether to keep the first or last row in a set of duplicate rows, or to remove all rows that are duplicates. [#4632]QTable
now behaves more consistently by making columns act as aQuantity
even if they are assigned a unit after the table is created. [#4497, #4884]
astropy.utils¶
- The astropy.utils.compat.argparse module has now been deprecated. Use the Python ‘argparse’ module directly instead. [#4462]
- The astropy.utils.compat.odict module has now been deprecated. Use the Python ‘collections’ module directly instead. [#4466]
- The astropy.utils.compat.gzip module has now been deprecated. Use the Python ‘gzip’ module directly instead. [#4464]
- The deprecated
ScienceStateAlias
class has been removed. [#2767, #4446] - The astropy.utils.compat.subprocess module has now been deprecated. Use the Python ‘subprocess’ module instead. [#4483]
- The astropy.utils.xml.unescaper module now also unescapes
'%2F'
to'/'
and'&&'
to'&'
in a given URL. [#4699] - The astropy.utils.metadata.MetaData descriptor has now two optional parameters: doc and copy. [#4921]
- The default IERS (Earth rotation) data now is now auto-downloaded via a new class IERS_Auto. When extrapolating UT1-UTC or polar motion values outside the available time range, the values are now clipped at the last available value instead of being linearly extrapolated. [#4436]
Bug fixes¶
astropy.coordinates¶
- Ameliorate a problem with
get_sun
not round-tripping due to approximations in the light deflection calculation. [#4952] - Ensure that
angle_utilities.position_angle
accepts floats, as stated in the docstring. [#3800] - Ensured that transformations for
GCRS
frames are correct for non-geocentric observers. [#4986] - Fixed a problem with the
Quantity._repr_latex_
method causing errors when showing anEarthLocation
in a Jupyter notebook. [#4542, #5068]
astropy.cosmology¶
astropy.io.ascii¶
- Fix a problem where the fast reader (with use_fast_converter=False) can fail on non-US locales. [#4363]
- Fix astropy.io.ascii.read handling of units for IPAC formatted files. Columns with no unit are treated as unitless not dimensionless. [#4867, #4947]
- Fix problems the header parsing in the sextractor reader. [#4603, #4910]
astropy.io.fits¶
GroupsHDU.is_image
property is now set toFalse
. [#4742]- Ensure scaling keywords are removed from header when unsigned integer data is converted to signed type. [#4974, #5053]
- Made TFORMx keyword check more flexible in test of compressed images to enable compatibility of the test with cfitsio 3.380. [#4646, #4653]
astropy.io.misc¶
astropy.io.votable¶
astropy.modeling¶
astropy.nddata¶
NDData
giving masked_Quantities as data-argument will use the implicitly passed mask, unit and value. [#4270]NDData
using a subclass implementingNDData
withNDArithmeticMixin
now allows error propagation. [#4270]- Fixed memory leak that happened when uncertainty of
NDDataArray
was set. [#4825, #4862] StdDevUncertainty
: During error propagation the unit of the uncertainty is taken into account. [#4272]NDArithmeticMixin
:divide
andmultiply
yield correct uncertainties if only one uncertainty is set. [#4152, #4272]
astropy.table¶
astropy.units¶
astropy.utils¶
- The astropy.utils.compat.fractions module has now been deprecated. Use the Python ‘fractions’ module directly instead. [#4463]
- Added
format_doc
decorator which allows to replace and/or format the current docstring of an object. [#4242] - Attributes using the astropy.utils.metadata.MetaData descriptor are now included in the sphinx documentation. [#4921]
astropy.vo¶
- Relaxed expected accuracy of Cone Search prediction test to reduce spurious failures. [#4382]
astropy.wcs¶
- astropy.wcs.to_header removes “-SIP” from CTYPE when SIP coefficients
are not written out, i.e.
relax
is eitherFalse
orNone
. astropy.wcs.to_header appends “-SIP” to CTYPE when SIP coefficients are written out, i.e.relax=True
. [#4814] - Made
wcs.bounds_check
callwcsprm_python2c
, which means it works even ifwcs.set
has not been called yet. [#4957, #4966]. - WCS objects can no longer be reverse-indexed, which was technically permitted but incorrectly implemented previously [#4962]
Other Changes and Additions¶
- Python 2.6 is no longer supported. [#4486]
- The bundled version of py.test has been updated to 2.8.3. [#4349]
- Reduce Astropy’s import time (
import astropy
) by almost a factor 2. [#4649] - Cython prerequisite for building changed to v0.19 in install.rst [#4705, #4710, #4719]
- All astropy.modeling functionality that was deprecated in Astropy 1.0 has been removed. [#4857]
- Added instructions for installing Astropy into CASA. [#4840]
- Added an example gallery to the docs demonstrating short snippets/examples. [#4734]
1.1.2 (2016-03-10)¶
New Features¶
Bug Fixes¶
astropy.io.ascii¶
astropy.io.fits¶
- Fixed possible segfault during error handling in FITS tile compression. [#4489]
- Fixed crash on pickling of binary table columns with the ‘X’, ‘P’, or ‘Q’ format. [#4514]
- Fixed memory / reference leak that could occur when copying a
FITS_rec
object (the.data
for table HDUs). [#520] - Fixed a memory / reference leak in
FITS_rec
that occurred in a wide range of cases, especially after writing FITS tables to a file, but in other cases as well. [#4539]
astropy.modeling¶
- Fix a bug to allow instantiation of a modeling class having a parameter
with a custom setter that takes two parameters
(value, model)
[#4656]
astropy.table¶
astropy.utils¶
astropy.visualization¶
astropy.wcs¶
- Fixed possible exception in handling of SIP headers that was introduced in v1.1.1. [#4492]
- Fixed a bug that caused WCS objects with a high dynamic range of values for certain parameters to lose precision when converted to a header. This occurred for example in cases of spectral cubes, where a spectral axis in Hz might have a CRVAL3 value greater than 1e10 but the spatial coordinates would have CRVAL1/2 values 8 to 10 orders of magnitude smaller. This bug was present in Astropy 1.1 and 1.1.1 but not 1.0.x. This has now been fixed by ensuring that all WCS keywords are output with 14 significant figures by default. [#4616]
1.1.1 (2016-01-08)¶
New Features¶
1.1 (2015-12-11)¶
New Features¶
astropy.config¶
- Added new tools
set_temp_config
andset_temp_cache
which can be used either as function decorators or context managers to temporarily use alternative directories in which to read/write the Astropy config files and download caches respectively. This is especially useful for testing, thoughset_temp_cache
may also be used as a way to provide an alternative (application specific) download cache for large data files, rather than relying on the default cache location in users’ home directories. [#3975]
astropy.coordinates¶
- Added
get_constellation
function andSkyCoord.get_constellation
convenience method to determine the constellation that a coordinate is in. [#3758] - Added
PrecessedGeocentric
frame, which is based on GCRS, but precessed to a specific requested mean equinox. [#3758] - Added
Supergalactic
frame to support de Vaucouleurs supergalactic coordinates. [#3892] SphericalRepresentation
now has a._unit_representation
class attribute to specify an equivalent UnitSphericalRepresentation. This allows subclasses of representations to pair up correctly. [#3757]- Added functionality to support getting the locations of observatories by
name. See
astropy.coordinates.EarthLocation.of_site
. [#4042] - Added ecliptic coordinates, including
GeocentricTrueEcliptic
,BarycentricTrueEcliptic
, andHeliocentricTrueEcliptic
. [#3749]
astropy.cosmology¶
astropy.io.ascii¶
- Automatically use
guess=False
when reading if the fileformat
is provided and the format parameters are uniquely specified. This update also removes duplicate format guesses to improve performance. [#3418] - Calls to ascii.read() for fixed-width tables may now omit one of the keyword
arguments
col_starts
orcol_ends
. Columns will be assumed to begin and end immediately adjacent to each other. [#3657] - Add a function
get_read_trace()
that returns a traceback of the attempted read formats for the last call toastropy.io.ascii.read
. [#3688] - Supports LZMA decompression via
get_readable_fileobj
[#3667] - Allow
-
character is Sextractor format column names. [#4168] - Improve DAOphot reader to read multi-aperture files [#3535, #4207]
astropy.io.fits¶
astropy.io.misc¶
- Support saving all meta information, description and units of tables and columns in HDF5 files [#4103]
astropy.io.votable¶
astropy.modeling¶
- Added a new
Parameter.validator
interface for setting a validation method on individual model parameters. See theParameter
documentation for more details. [#3910] - The projection classes that are named based on the 3-letter FITS
WCS projections (e.g.
Pix2Sky_TAN
) now have aliases using longer, more descriptive names (e.g.Pix2Sky_Gnomonic
). [#3583] - All of the standard FITS WCS projection types have been
implemented in
astropy.modeling.projections
(by wrapping WCSLIB). [#3906] - Added
Sersic1D
andSersic2D
model classes. [#3889] - Added the Voigt profile to existing models. [#3901]
- Added
bounding_box
property andrender_model
function [#3909]
astropy.nddata¶
astropy.stats¶
- Added
sigma_lower
andsigma_upper
keywords tosigma_clip
to allow for non-symmetric clipping. [#3595] - Added
cenfunc
,stdfunc
, andaxis
keywords tosigma_clipped_stats
. [#3792] sigma_clip
automatically masks invalid input values (NaNs, Infs) before performing the clipping [#4051]- Added the
histogram
routine, which is similar tonp.histogram
but includes several additional options for automatic determination of optimal histogram bins. Associated helper routines includebayesian_blocks
,friedman_bin_width
,scott_bin_width
, andknuth_bin_width
. This functionality was ported from the astroML library. [#3756] - Added the
bayesian_blocks
routine, which implements a dynamic algorithm for locating change-points in various time series. [#3756] - A new function
poisson_conf_interval()
was added to allow easy calculation of several standard formulae for the error bars on the mean of a Poisson variable estimated from a single sample.
astropy.table¶
add_column()
andadd_columns()
now haverename_duplicate
option to rename new column(s) rather than raise exception when its name already exists. [#3592]- Added
Table.to_pandas
andTable.from_pandas
for converting to/from pandas dataframes. [#3504] - Initializing a
Table
withColumn
objects no longer requires that the columnname
attribute be defined. [#3781] - Added an
info
property toTable
objects which provides configurable summary information about the table and its columns. [#3731] - Added an
info
property to column classes (Column
or mixins). This serves a dual function of providing configurable summary information about the column, and acting as a manager of column attributes such as name, format, or description. [#3731] - Updated table and column representation to use the
dtype_info_name
function for the dtype value. Removed the default “masked=False” from the table representation. [#3868, #3869] - Updated row representation to be consistent with the corresponding table representation for that row. Added HTML representation so a row displays nicely in IPython notebook.
- Added a new table indexing engine allowing for the creation of
indices on one or more columns of a table using
add_index
. These indices enable new functionality such as searching for rows by value usingloc
andiloc
, as well as increased performance for certain operations. [#3915, #4202] - Added capability to include a structured array or recarray in a table as a mixin column. This allows for an approximation of nested tables. [#3925]
- Added
keep_byteorder
option toTable.as_array()
. See the “API Changes” section below. [#4080] - Added a new method
Table.replace_column()
to replace an existing column with a new data column. [#4090] - Added a
tableclass
option toTable.pformat()
to allow specifying a list of CSS classes added to the HTML table. [#4131] - New CSS for jsviewer table [#2917, #2982, #4174]
- Added a new
Table.show_in_notebook
method that shows an interactive view of a Table (similar toTable.show_in_browser(jsviewer=True)
) in an Python/Jupyter notebook. [#4197] - Added column alignment formatting for better pprint viewing experience. [#3644]
astropy.tests¶
- Added new test config options,
config_dir
andcache_dir
(these can be edited insetup.cfg
or as extra command-line options to py.test) for setting the locations to use for the Astropy config files and download caches (see also the relatedset_temp_config/cache
features added inastropy.config
). [#3975]
astropy.time¶
- Add support for FITS standard time strings. [#3547]
- Allow the
format
attribute to be updated in place to change the default representation of aTime
object. [#3673] - Add support for shape manipulation (reshape, ravel, etc.). [#3224]
- Add argmin, argmax, argsort, min, max, ptp, sort methods. [#3681]
- Add
Time.to_datetime
method for convertingTime
objects to timezone-aware datetimes. [#4119, #4124]
astropy.units¶
- Added furlong to imperial units. [#3529]
- Added mil to imperial units. [#3716]
- Added stone to imperial units. [#4192]
- Added Earth Mass (
M_earth
) and Jupiter mass (M_jup
) to units [#3907] - Added support for functional units, in particular the logarithmic ones
Magnitude
,Decibel
, andDex
. [#1894] - Quantities now work with the unit support in matplotlib. See Plotting quantities. [#3981]
- Clarified imperial mass measurements and added pound force (lbf), kilopound (kip), and pound per square inch (psi). [#3409]
astropy.utils¶
- Added new
OrderedDescriptor
andOrderedDescriptorContainer
utility classes that make it easier to implement classes with declarative APIs, wherein class-level attributes have an inherit “ordering” to them that is specified by the order in which those attributes are defined in the class declaration (by defining them using special descriptors that haveOrderedDescriptor
as a base class). See the API documentation for these classes for more details. Coordinate frames and models now use this interface. [#3679] - The
get_pkg_data_*
functions now take an optionalpackage
argument which allows specifying any package to read package data filenames or content out of, as opposed to only being able to use data from the package that the function is called from. [#4079] - Added function
dtype_info_name
to thedata_info
module to provide the name of adtype
for human-readable informational purposes. [#3868] - Added
classproperty
decorator–this is toproperty
asclassmethod
is to normal instance methods. [#3982] iers.open
now handles network URLs, as well as local paths. [#3850]- The
astropy.utils.wraps
decorator now takes an optionalexclude_args
argument not shared by the standard librarywraps
decorator (as it is unique to the Astropy version’s ability of copying the wrapped function’s argument signature).exclude_args
allows certain arguments on the wrapped function to be excluded from the signature of the wrapper function. This is particularly useful when wrapping an instance method as a function (to exclude theself
argument). [#4017] get_readable_fileobj
can automatically decompress LZMA (‘.xz’) files using thelzma
module of Python 3.3+ or, when available, thebackports.lzma
package on earlier versions. [#3667]- The
resolve_name
utility now accepts any number of additional positional arguments that are automatically dotted together with the firstname
argument. [#4083] - Added
is_url_in_cache
for resolving paths to cached files via URLS and checking if files exist. [#4095] - Added a
step
argument to theProgressBar.map
method to give users control over the update frequency of the progress bar. [#4191]
astropy.visualization¶
- Added a function / context manager
quantity_support
for enabling seamless plotting ofQuantity
instances in matplotlib. [#3981] - Added the
hist
function, which is similar toplt.hist
but includes several additional options for automatic determination of optimal histogram bins. This functionality was ported from the astroML library. [#3756]
astropy.wcs¶
The included version of wcslib has been upgraded to 5.10. [#3992, #4239]
The minimum required version of wcslib in the 4.x series remains 4.24.
The minimum required version of wcslib in the 5.x series is 5.8. Building astropy against a wcslib 5.x prior to 5.8 will raise an
ImportError
whenastropy.wcs
is imported.The wcslib changes relevant to astropy are:
The FITS headers returned by
astropy.wcs.WCS.to_header
andastropy.wcs.WCS.to_header_string
now include values with more precision. This will result in numerical differences in your results if you convertastropy.wcs.WCS
objects to FITS headers and use the results.astropy.wcs.WCS
now recognises theTPV
,TPD
,TPU
,DSS
,TNX
andZPX
polynomial distortions.Added relaxation flags to allow
PC0i_0ja
,PV0j_0ma
, andPS0j_0ma
(i.e. with leading zeroes on the index).Tidied up error reporting, particularly relating to translating status returns from lower-level functions.
Changed output formatting of floating point values in
to_header
.Enhanced text representation of
WCS
objects. [#3604]The
astropy.tests.helper
module is now part of the public API (and has a documentation page). This module was in previous releases of astropy, but was not considered part of the public API until now. [#3890]There is a new function
astropy.online_help
to search the astropy documentation and display the result in a web browser. [#3642]
API changes¶
astropy.cosmology¶
FLRW._tfunc
andFLRW._xfunc
are marked as deprecated. Users should use the new public interfacesFLRW.lookback_time_integrand
andFLRW.abs_distance_integrand
instead. [#3767]
astropy.io.ascii¶
- The default header line processing was made to be consistent with data line
processing in that it now ignores blank lines that may have whitespace
characters. Any code that explicitly specifies a
header_start
value for parsing a file with blank lines in the header containing whitespace will need to be updated. [#2654]
astropy.io.fits¶
- The
uint
argument tofits.open
is now True by default; that is, arrays using the FITS unsigned integer convention will be detected, and read as unsigned integers by default. A new config option forio.fits
,enable_uint
, can be changed to False to revert to the original behavior of ignoring theuint
convention unless it is explicitly requested withuint=True
. [#3916] - The
ImageHDU.NumCode
andImageHDU.ImgCode
attributes (and same for other classes derived from_ImageBaseHDU
) are deprecated. Instead, theastropy.io.fits
module-level constantsBITPIX2DTYPE
andDTYPE2BITPIX
can be used. [#3916]
astropy.modeling¶
- Note: Comparisons of model parameters with array-like values now yields a Numpy boolean array as one would get with normal Numpy array comparison. Previously this returned a scalar True or False, with True only if the comparison was true for all elements compared, which could lead to confusing circumstances. [#3912]
- Using
model.inverse = None
to reset a model’s inverse to its default is deprecated. In the future this syntax will explicitly make a model not have an inverse (even if it has a default). Instead, usedel model.inverse
to reset a model’s inverse to its default (if it has a default, otherwise this just deletes any custom inverse that has been assigned to the model and is still equivalent to settingmodel.inverse = None
). [#4236] - Adds a
model.has_user_inverse
attribute which indicates whether or not a user has assigned a custom inverse tomodel.inverse
. This is just for informational purposes, for example, for software that introspects model objects. [#4236] - Renamed the parameters of
RotateNative2Celestial
andRotateCelestial2Native
fromphi
,theta
,psi
tolon
,lat
andlon_pole
. [#3578] - Deprecated the
Pix2Sky_AZP.check_mu
andSky2Pix_AZP.check_mu
methods (these were obscure “accidentally public” methods that were probably not used by anyone). [#3910] - Added a phase parameter to the Sine1D model. [#3807]
astropy.stats¶
astropy.table¶
Table.as_array()
always returns a structured array with each column in the system’s native byte order. The optionalkeep_byteorder=True
option will keep each column’s data in its original byteorder. [#4080]Table.simple_table()
now creates tables with int64 and float64 types instead of int32 and float64. [#4114]- An empty table can now be initialized without a
names
argument as long as a validdtype
argument (with names embedded) is supplied. [#3977]
astropy.time¶
- The
astropy_time
attribute and time format has been removed from the public interface. Existing code that instantiates a new time object usingformat='astropy_time'
can simply omit theformat
specification. [#3857]
astropy.units¶
- Single-item
Quantity
instances with recorddtype
will now have theirisscalar
property returnTrue
, consistent with behaviour for numpy arrays, wherenp.void
records are considered scalar. [#3899] - Three changes relating to the FITS unit format [#3993]:
- The FITS unit format will no longer parse an arbitrary number as a
scale value. It must be a power of 10 of the form
10^^k
,10^k
,10+k
,10-k
and10(k)
. [#3993] - Scales that are powers of 10 can be written out. Previously, any non-1.0 scale was rejected.
- The
*
character is accepted as a separator between the scale and the units. - Unit formatter classes now require the
parse
andto_string
methods are now required to be classmethods (and the formatter classes themselves are assumed to be singletons that are not instantiated). As unit formatters are mostly an internal implementation detail this is not likely to affect any users. [#4001] - CGS E&M units are now defined separately from SI E&M units, and have distinct physical types. [#4255, #4355]
astropy.utils¶
- All of the
get_pkg_data_*
functions take an optionalpackage
argument as their second positional argument. So any code that previously passed other arguments to these functions as positional arguments might break. Use keyword argument passing instead to mitigate this. [#4079] astropy.utils.iers
now uses aQTable
internally, which means that the numerical columns are stored asQuantity
, with full support for units. Furthermore, theut1_utc
method now returns aQuantity
instead of a float or an array (as didpm_xy
already). [#3223]astropy.utils.iers
now throws anIERSRangeError
, a subclass ofIndexError
, rather than a rawIndexError
. This allows more fine-grained catching of situations where aTime
is beyond the range of the loaded IERS tables. [#4302]
astropy.wcs¶
- When compiled with wcslib 5.9 or later, the FITS headers returned
by
astropy.wcs.WCS.to_header
andastropy.wcs.WCS.to_header_string
now include values with more precision. This will result in numerical differences in your results if you convertastropy.wcs.WCS
objects to FITS headers and use the results. - If NAXIS1 or NAXIS2 is not passed with the header object to WCS.calc_footprint, a ValueError is raised. [#3557]
Bug fixes¶
astropy.constants¶
- The constants
Ry
andu
are now properly used inside the corresponding units. The latter have changed slightly as a result. [#4229]
astropy.coordinates¶
- Internally,
coordinates
now consistently uses the appropriate time scales for using ERFA functions. [#4302]
astropy.io.ascii¶
- Fix a segfault in the fast C parser when one of the column headers is empty [#3545].
- Fix several bugs that prevented the fast readers from being used when guessing the file format. Also improved the read trace information to better understand format guessing. [#4115]
- Fix an underlying problem that resulted in an uncaught TypeError exception when reading a CDS-format file with guessing enabled. [#4120]
astropy.modeling¶
Other Changes and Additions¶
- The
./setup.py test
command is now implemented in theastropy.tests
module again (previously its implementation had been moved into astropy-helpers). However, that made it difficult to synchronize changes to the Astropy test runner with changes to the./setup.py test
UI. astropy-helpers v1.1 and above will detect this implementation of thetest
command, when present, and use it instead of the old version that was included in astropy-helpers (most users will not notice any difference as a result of this change). [#4020] - The repr for
Table
no longer displaysmasked=False
since tables are not masked by default anyway. [#3869] - The version of
PLY
that ships with astropy has been updated to 3.6. - WCSAxes is now required for doc builds. [#4074]
- The migration guide from pre-v0.4 coordinates has been removed to avoid
cluttering the
astropy.coordinates
documentation with increasingly irrelevant material. To see the migration guide, we recommend you simply look to the archived documentation for previous versions, e.g. http://docs.astropy.org/en/v1.0/coordinates/index.html#migrating-from-pre-v0-4-coordinates [#4203] - In
astropy.coordinates
, the transformations between GCRS, CIRS, and ITRS have been adjusted to more logically reflect the order in which they actually apply. This should not affect most coordinate transformations, but may affect code that is especially sensitive to machine precision effects that change when the order in which transformations occur is changed. [#4255] - Astropy v1.1.0 will be the last release series to officially support Python 2.6. A deprecation warning will now be issued when using Astropy in Python 2.6 (this warning can be disabled through the usual Python warning filtering mechanisms). [#3779]
1.0.13 (2017-05-29)¶
1.0.12 (2017-03-05)¶
Bug Fixes¶
astropy.convolution¶
- Fixed bug in
discretize_integrate_2D
in which x and y coordinates where swapped. [#5634]
astropy.coordinates¶
- Fixed a bug where
get_transform
could sometimes produce confusing errors because of a typo in the input validation. [#5645]
astropy.io.fits¶
- Guard against extremely unlikely problems in compressed images, which could lead to memory unmapping errors. [#5775]
astropy.io.votable¶
1.0.11 (2016-12-22)¶
Bug Fixes¶
astropy.coordinates¶
- Initialising a SkyCoord from a list containing a single SkyCoord no longer removes the distance from the coordinate. [#5270]
- Fix errors in the implementation of the conversion to and from FK4 frames without e-terms, which will have affected coordinates not on the unit sphere (i.e., with distances). [#4293]
- Fix bug where with cds units enabled it was no longer possible to initialize
an
Angle
. [#5483] - Ensure that
search_around_sky
andsearch_around_3d
return integer type index arrays for empty (non) matches. [#4877, #5083] - Return an empty set of matches for
search_around_sky
andsearch_around_3d
when one or both of the input coordinate arrays is empty. [#4875, #5083]
astropy.io.ascii¶
- Fix a bug with empty value at end of tab-delimited table on Windows. [#5370]
- Fix reading of big ASCII tables (more than 2Gb) with the fast reader. [#5319]
- Fix segfault with FastCsv and row with too many columns. [#5534]
- Fix problem reading an AASTex format table that does not have
\\
at the end of the last table row. [#5427]
astropy.io.fits¶
- Removed raising of AssertionError that could occur after closing or deleting compressed image data. [#4690, #4694, #4948]
- Fixed bug that caused an ignored exception to be displayed under certain conditions when terminating a script after using fits.getdata(). [#4977]
- Fixed usage of inplace operations that were raising an exception with recent versions of Numpy due to implicit casting. [#5250]
astropy.io.votable¶
- Fixed bug of
Resource.__repr__()
having undefined attributes and variables. [#5382]
astropy.modeling¶
- CompoundModel now correctly inherits _n_models, allowing the use of model sets [#5358]
astropy.units¶
1.0.10 (2016-06-09)¶
Bug Fixes¶
astropy.coordinates¶
astropy.io.fits¶
- Fix convenience functions (
getdata
,getheader
,append
,update
) to close files. [#4786]
astropy.io.votable¶
- The astropy.io.votable.validator.html module is updated to handle division by zero when generating validation report. [#4699]
astropy.table¶
astropy.units¶
- Duplicates between long and short names are now removed in the
names
andaliases
properties of units. [#5036]
astropy.utils¶
astropy.vo¶
- Cache option now properly caches both downloaded JSON database and XML VO tables. [#4699]
- The astropy.vo.validator.conf.conesearch_urls listing is updated to reflect external changes to some VizieR Cone Search services. [#4699]
- VOSDatabase decodes byte-string to UTF-8 instead of ASCII to avoid UnicodeDecodeError for some rare cases. Fixed a Cone Search test that is failing as a side-effect of #4699. [#4757]
1.0.9 (2016-03-10)¶
New Features¶
Bug Fixes¶
astropy.io.ascii¶
- Fixed addition of new line characters after last row of data in ascii.latex.AASTex. [#4561]
- Fixed reading of Latex tables where the
\tabular
tag is in the first line. [#4595] - Fix use of plain format strings with the fast writer. [#4517]
- Fix bug writing space-delimited file when table has empty fields. [#4417]
astropy.io.fits¶
- Fixed possible segfault during error handling in FITS tile compression. [#4489]
- Fixed crash on pickling of binary table columns with the ‘X’, ‘P’, or ‘Q’ format. [#4514]
- Fixed memory / reference leak that could occur when copying a
FITS_rec
object (the.data
for table HDUs). [#520] - Fixed a memory / reference leak in
FITS_rec
that occurred in a wide range of cases, especially after writing FITS tables to a file, but in other cases as well. [#4539]
astropy.modeling¶
astropy.stats¶
1.0.8 (2016-01-08)¶
1.0.7 (2015-12-04)¶
Bug Fixes¶
astropy.io.ascii¶
- Fix fast writer so bytestring column output is not prefixed by ‘b’ in Python 3. [#4350]
astropy.io.fits¶
- Fixed a regression that could cause writes of large FITS files to be truncated. [#4307]
- Astropy v1.0.6 included a fix (#4228) for an obscure case where the TDIM of a table column is smaller than the repeat count of its data format. This updates that fix in such a way that it works with Numpy 1.10 as well. [#4266]
1.0.6 (2015-10-22)¶
Bug Fixes¶
astropy.analytic_functions¶
- Fixed blackbody analytic functions to properly support arrays of temperatures. [#4251]
astropy.coordinates¶
- Fixed errors in transformations for objects within a few AU of the Earth. Included substantive changes to transformation machinery that may change distances at levels ~machine precision for other objects. [#4254]
astropy.io.fits¶
fitsdiff
and related functions now do a better job reporting differences between values that are different types but have the same representation (ex: the string ‘0’ versus the number 0). [#4122]- Miscellaneous fixes for supporting Numpy 1.10. [#4228]
- Fixed an issue where writing a column of unicode strings to a FITS table resulted in a quadrupling of size of the column (i.e. the format of the FITS column was 4 characters for every one in the original strings). [#4228]
- Added support for an obscure case (but nonetheless allowed by the FITS standard) where a column has some TDIMn keyword, but a repeat count in the TFORMn column greater than the number of elements implied by the TDIMn. For example TFORMn = 100I, but TDIMn = ‘(5,5)’. In this case the TDIMn implies 5x5 arrays in the column, but the TFORMn implies a 100 element 1-D array in the column. In this case the TDIM takes precedence, and the remaining bytes in the column are ignored. [#4228]
Other Changes and Additions¶
- All tests now pass against Numpy v1.10.x. This implies nominal support for Numpy 1.10.x moving forward (but there may still be unknown issues). For example, there is already a known performance issue with tables containing large multi-dimensional columns–for example, tables that contain entire images in one or more of their columns. This is a known upstream issue in Numpy. [#4259]
1.0.5 (2015-10-05)¶
Bug Fixes¶
astropy.constants¶
- Rename units -> unit and error -> uncertainty in the
repr
andstr
of constants to match attribute names. [#4147]
astropy.coordinates¶
astropy.io.fits¶
- Fix bug when extending one header (without comments) with another (with comments). [#3967]
- Somewhat improved resource usage for FITS data–previously a new
mmap
was opened for each HDU of a FITS file accessed through anHDUList
. Eachmmap
used up a single file descriptor, causing problems with system resource limits for some users. Now only a singlemmap
is opened, and shared for the data of all HDUs. Note: The problem still persists with using the “convenience” functions. For example usingfits.getdata
will create onemmap
per HDU read this way (as opposed to opening the file withfits.open
and accessing the HDUs through theHDUList
object). [#4097] - Fix bug where reading a file without a newline failed with an unrelated / unhelpful exception. [#4160]
astropy.nddata¶
astropy.table¶
- Fix an issue with setting fill value when column dtype is changed. [#4088]
- Fix bug when unpickling a bare Column where the _parent_table attribute was not set. This impacted the Column representation. [#4099]
- Fix issue with the web browser opening with an empty page, and ensure that the url is correctly formatted for Windows. [#4132]
- Fix NameError in table stack exception message. [#4213]
astropy.utils¶
resolve_name
no longer causessys.modules
to be cluttered with additional copies of modules under a package imported likeresolve_name('numpy')
. [#4084]console
was updated to support IPython 4.x and Jupyter 1.x. This should suppress a ShimWarning that was appearing at import of astropy with IPython 4.0 or later. [#4078]- Temporary downloaded files created by
get_readable_fileobj
when passed a URL are now deleted immediately after the file is closed. [#4198]
astropy.visualization¶
1.0.4 (2015-08-11)¶
New Features¶
Bug Fixes¶
astropy.coordinates¶
- Fix bug where coordinate representation setting gets reset to default value when coordinate array is indexed or sliced. [#3824]
- Fixed confusing warning message shown when using dates outside current IERS data. [#3844]
get_sun
now yields a scalar when the input time is a scalar (this was a regression in v1.0.3 from v1.0.2) [#3998, #4039]- Fixed bug where some scalar coordinates were incorrectly being changed to length-1 array coordinates after transforming through certain frames. [#3920, #4039]
- Fixed bug causing the
separation
methods ofSkyCoord
and frame classes to fail due to infinite recursion [#4033, #4039] - Made it so that passing in a list of
SkyCoord
objects that are in UnitSphericalRepresentation to theSkyCoord
constructor appropriately yields a new object in UnitSphericalRepresentation [#3938, #4039]
astropy.io.fits¶
- Fixed crash when updating data in a random groups HDU opened in update mode. [#3730]
- Fixed incorrect checksum / datasum being written when re-writing a scaled
HDU (i.e. non-trivial BSCALE and/or BZERO) with
do_not_scale_image_data=False
. [#3883] - Fixed stray deprecation warning in
BinTableHDU.copy()
. [#3798] - Better handling of the
BLANK
keyword when auto-scaling scaled image data. TheBLANK
keyword is now removed from the header after auto-scaling is applied, and it is restored properly (with floating point NaNs replaced by the filler value) when updating a file opened with thescale_back=True
argument. Invalid usage of theBLANK
keyword is also better warned about during validation. [#3865] - Reading memmaped scaled images won’t fail when
do_not_scale_image_data=True
(that is, since we’re just reading the raw / physical data there is no reason mmap can’t be used). [#3766] - Fixed a reference cycle that could sometimes cause FITS table-related
objects (
BinTableHDU
,ColDefs
, etc.) to hang around in memory longer than expected. [#4012]
astropy.modeling¶
astropy.time¶
- Fixed iteration of scalar
Time
objects so thatiter()
correctly raises aTypeError
on them (while still allowingTime
arrays to be iterated). [#4048]
astropy.units¶
- Added frequency-equivalency check when declaring doppler equivalencies [#3728]
- Define
floor_divide
(//
) forQuantity
to be consistentdivmod
, such that it only works where the quotient is dimensionless. This guarantees that(q1 // q2) * q2 + (q1 % q2) == q1
. [#3817] - Fixed the documentation of supported units to correctly report support for SI prefixes. Previously the table of supported units incorrectly showed several derived unit as not supporting prefixes, when in fact they do. [#3835]
- Fix a crash when calling
astropy.units.cds.enable()
. This will now “set” rather than “add” units to the active set to avoid the namespace clash with the default units. [#3873] - Ensure in-place operations on
float32
quantities work. [#4007]
astropy.utils¶
- The
deprecated
decorator did not correctly wrap classes that have a custom metaclass–the metaclass could be dropped from the deprecated version of the class. [#3997] - The
wraps
decorator would copy the wrapped function’s name to the wrapper function even when'__name__'
is excluded from theassigned
argument. [#4016]
Misc¶
fitscheck
no longer causes scaled image data to be rescaled when adding checksums to existing files. [#3884]- Fixed an issue where running
import astropy
from within the source tree did not automatically build the extension modules if the source is from a source distribution (as opposed to a git repository). [#3932] - Fixed multiple instances of a bug that prevented Astropy from being used
when compiled with the
python -OO
flag, due to it causing all docstrings to be stripped out. [#3923] - Removed source code template files that were being installed accidentally alongside installed Python modules. [#4014]
- Fixed a bug in the exception logging that caused a crash in the exception handler itself on Python 3 when exceptions do not include a message. [#4056]
1.0.3 (2015-06-05)¶
New Features¶
API Changes¶
astropy.io.ascii¶
- Note that HTML formatted tables will not always be found with guess mode
unless it passes certain heuristics that strongly suggest the presence of
HTML in the input. Code that expects to read tables from HTML should
specify
format='html'
explicitly. See bug fixes below for more details. [#3693]
Bug Fixes¶
astropy.coordinates¶
astropy.io.ascii¶
- Remove HTML from the list of automatically-guessed formats when reading if the file does not appear to be HTML. This was necessary to avoid a commonly-encountered segmentation fault occurring in the libxml parser on MacOSX. [#3693]
astropy.modeling¶
astropy.testing¶
- The Astropy py.test plugins that disable unintentional internet access in tests were also blocking use of local UNIX sockets in tests, which prevented testing some multiprocessing code–fixed. [#3713]
astropy.units¶
- Supported full SI prefixes for the barn unit (“picobarn”, “femtobarn”, etc.) [#3753]
- Fix loss of precision when multiplying non-whole-numbered powers
of units together. For example, before this change,
(u.m ** 1.5) ** Fraction(4, 5)
resulted in an inaccurate floating-point power of1.2000000000000002
. After this change, the exact rational number ofFraction(6, 5)
is maintained. [#3790] - Fixed printing of object ndarrays containing multiple Quantity
objects with differing / incompatible units. Note: Unit conversion errors
now cause a
UnitConversionError
exception to be raised. However, this is a subclass of theUnitsError
exception used previously, so existing code that catchesUnitsError
should still work. [#3778]
0.4.6 (2015-05-29)¶
1.0.2 (2015-04-16)¶
New Features¶
Bug Fixes¶
astropy.config¶
- The pre-astropy-0.4 configuration API has been fixed. It was inadvertently broken in 1.0.1. [#3627]
astropy.io.fits¶
- Fixed a severe memory leak that occurred when reading tile compressed images. [#3680]
- Fixed bug where column data could be unintentionally byte-swapped when copying data from an existing FITS file to a new FITS table with a TDIMn keyword for that column. [#3561]
- The
ColDefs.change_attrib
,ColDefs.change_name
, andColDefs.change_unit
methods now work as advertised. It is also possible (and preferable) to update attributes directly onColumn
objects (for example settingcolumn.name
), and the change will be accurately reflected in any associated table data and its FITS header. [#3283, #1539, #2618] - Fixes an issue with the
FITS_rec
interface to FITS table data, where aFITS_rec
created by copying an existing FITS table but adding new rows could not be sliced or masked correctly. [#3641] - Fixed handling of BINTABLE with TDIMn of size 1. [#3580]
astropy.io.votable¶
- Loading a
TABLE
element without anyDATA
now correctly creates a 0-row array. [#3636]
astropy.modeling¶
- Added workaround to support inverses on compound models when one of the sub-models is itself a compound model with a manually-assigned custom inverse. [#3542]
- Fixed instantiation of polynomial models with constraints for parameters (constraints could still be assigned after instantiation, but not during). [#3606]
- Fixed fitting of 2D polynomial models with the
LeVMarLSQFitter
. [#3606]
astropy.table¶
- Ensure
QTable
can be pickled [#3590] - Some corner cases when instantiating an
astropy.table.Table
with a Numpy array are handled [#3637]. Notably: - a zero-length array is the same as passing
None
- a scalar raises a
ValueError
- a one-dimensional array is treated as a single row of a table.
- Ensure a
Column
without units is treated as anarray
, not as an dimensionlessQuantity
. [#3648]
astropy.units¶
- Ensure equivalencies that do more than just scale a
Quantity
are properly handled also inufunc
evaluations. [#2496, #3586] - The LaTeX representation of the Angstrom unit has changed from
\overset{\circ}{A}
to\mathring{A}
, which should have better support across regular LaTeX, MathJax and matplotlib (as of version 1.5) [#3617]
1.0.1 (2015-03-06)¶
Bug Fixes¶
astropy.io.ascii¶
- Fix a segfault in the fast C parser when one of the column headers is empty [#3545].
- Fixed support for reading inf and nan values with the fast reader in
Windows. Also fixed in the case of using
use_fast_converter=True
with the fast reader. [#3525] - Fixed use of mmap in the fast reader on Windows. [#3525]
- Fixed issue where commented header would treat comments defining the table (i.e. column headers) as purely information comments, leading to problems when trying to round-trip the table. [#3562]
astropy.modeling¶
- Fixed propagation of parameter constraints (‘fixed’, ‘bounds’, ‘tied’) between compound models and their components. There is may still be some difficulty defining ‘tied’ constraints properly for use with compound models, however. [#3481]
Miscellaneous¶
1.0 (2015-02-18)¶
General¶
- Astropy now requires Numpy 1.6.0 or later.
New Features¶
astropy.analytic_functions¶
- The
astropy.analytic_functions
was added to contain analytic functions useful for astronomy [#3077].
astropy.coordinates¶
astropy.coordinates
now has a full stack of frames allowing transformations from ICRS or other celestial systems down to Alt/Az coordinates. [#3217]astropy.coordinates
now has aget_sun
function that gives the coordinates of the Sun at a specified time. [#3217]SkyCoord
now hasto_pixel
andfrom_pixel
methods that convert between celestial coordinates asSkyCoord
objects and pixel coordinates given anastropy.wcs.WCS
object. [#3002]SkyCoord
now hassearch_around_sky
andsearch_around_3d
convenience methods that allow searching for all coordinates within a certain distance of anotherSkyCoord
. [#2953]SkyCoord
can now accept a frame instance for theframe=
keyword argument. [#3063]SkyCoord
now has aguess_from_table
method that can be used to quickly createSkyCoord
objects from anastropy.table.Table
object. [#2951]astropy.coordinates
now has aGalactocentric
frame, a coordinate frame centered on a (user specified) center of the Milky Way. [#2761, #3286]SkyCoord
now accepts more formats of the coordinate string when the representation hasra
anddec
attributes. [#2920]SkyCoord
can now accept lists ofSkyCoord
objects, frame objects, or representation objects and will combine them into a single object. [#3285]- Frames and
SkyCoord
instances now have a methodis_equivalent_frame
that can be used to check that two frames are equivalent (ignoring the data). [#3330] - The
__repr__
of coordinate objects now shows scalar coordinates in the same format as vector coordinates. [#3350, 3448]
astropy.cosmology¶
- Added
lookback_distance
, which isc * lookback_time
. [#3145] - Add baryonic matter density and dark matter only density parameters to cosmology objects [#2757].
- Add a
clone
method to cosmology objects to allow copies of cosmological objects to be created with the specified variables modified [#2592]. - Increase default numerical precision of
z_at_value
following the accurate by default, fast by explicit request model [#3074]. - Cosmology functions that take a single (redshift) input now broadcast like numpy ufuncs. So, passing an arbitrarily shaped array of inputs will produce an output of the same shape. [#3178, #3194]
astropy.io.ascii¶
- Simplify the way new Reader classes are defined, allowing custom behavior
entirely by overriding inherited class attributes instead of setting
instance attributes in the Reader
__init__
method. [#2812] - There is now a faster C/Cython engine available for reading and writing
simple ASCII formats like CSV. Both are enabled by default, and fast
reading will fall back on an ordinary reader in case of a parsing
failure. Their behavior can be altered with the parameter
fast_reader
inread
andfast_writer
inwrite
. [#2716] - Make Latex/AASTex tables use unit attribute of Column for output. [#3064]
- Store comment lines encountered during reading in metadata of the
output table via
meta['comment_lines']
. [#3222] - Write comment lines in Table metadata during output for all basic formats,
IPAC, and fast writers. This functionality can be disabled with
comment=False
. [#3255] - Add reader / writer for the Enhanced CSV format which stores table and column meta data, in particular data type and unit. [#2319]
astropy.io.fits¶
- The
fitsdiff
script ignores some things by default when comparing fits files (e.g. empty header lines). This adds a--exact
option where nothing is ignored. [#2782, #3110] - The
fitsheader
script now takes a--keyword
option to extract a specific keyword from the header of a FITS file, and a--table
option to export headers into any of the data formats supported byastropy.table
. [#2555, #2588] Section
now supports all advanced indexing featuresndarray
does (slices with any steps, integer arrays, boolean arrays, None, Ellipsis). It also properly returns scalars when this is appropriate. [#3148]
astropy.io.votable¶
astropy.io.votable.parse
now takes adatatype_mapping
keyword argument to map invalid datatype names to valid ones in order to support non-compliant files. [#2675]
astropy.modeling¶
- Added the capability of creating new “compound” models by combining existing models using arithmetic operators. See the “What’s New in 1.0” page in the Astropy documentation for more details. [#3231]
- A new
custom_model
decorator/factory function has been added for converting normal functions toModel
classes that can work within the Astropy modeling framework. This replaces the oldcustom_model_1d
function which is now deprecated. The new function works the same as the old one but is less limited in the types of models it can be used to created. [#1763] - The
Model
andFitter
classes have.registry
attributes which provide sets of all loadedModel
andFitter
classes (this is useful for building UIs for models and fitting). [#2725] - A dict-like
meta
member was added toModel
. it is to be used to store any optional information which is relevant to a project and is not in the standardModel
class. [#2189] - Added
Ellipse2D
model. [#3124]
astropy.nddata¶
- New array-related utility functions in
astropy.nddata.utils
for adding and removing arrays from other arrays with different sizes/shapes. [#3201] - New metaclass
NDDataBase
for enforcing the nddata interface in subclasses without restricting implementation of the data storage. [#2905] - New mixin classes
NDSlicingMixin
for slicing,NDArithmeticMixin
for arithmetic operations, andNDIOMixin
for input/ouput in NDData. [#2905] - Added a decorator
support_nddata
that can be used to write functions that can either take separate arguments or NDData objects. [#2855]
astropy.stats¶
astropy.table¶
- Changed the internal implementation of the
Table
class changed so that it no longer uses numpy structured arrays as the core table data container. [#2790, #3179] - Tables can now be written to an html file that includes interactive
browsing capabilities. To write out to this format, use
Table.write('filename.html', format='jsviewer')
. [#2875] - A
quantity
property andto
method were added toTable
columns that allow the column values to be easily converted toastropy.units.Quantity
objects. [#2950] - Add
unique
convenience method to table. [#3185]
astropy.time¶
Time
can now handle arbitrary array dimensions, with operations following standard numpy broadcasting rules. [#3138]
astropy.units¶
- Support for VOUnit has been updated to be compliant with version 1.0 of the standard. [#2901]
- Added an
insert
method to insert values into aQuantity
object. This is similar to thenumpy.insert
function. [#3049] - When viewed in IPython,
Quantity
objects with array values now render using LaTeX and scientific notation. [#2271] - Added
units.quantity_input
decorator to validate quantity inputs to a function for unit compatibility. [#3072] - Added
units.astronomical_unit
as a long form forunits.au
. [#3303]
astropy.utils¶
- Added a new decorator
astropy.utils.wraps
which acts as a replacement for the standard library’sfunctools.wraps
, the only difference being that the decorated function also preserves the wrapped function’s call signature. [#2849] astropy.utils.compat.numpy
has been revised such that it can include patched versions of routines from newernumpy
versions. The first addition is a version ofbroadcast_arrays
that can be used withQuantity
and otherndarray
subclasses (using thesubok=True
flag). [#2327]- Added
astropy.utils.resolve_name
which returns a member of a module or class given the fully qualified dotted name of that object as a string. [#3389] - Added
astropy.utils.minversion
which can be used to check minimum version requirements of Python modules (to test for specific features and/ or bugs and the like). [#3389]
astropy.visualization¶
- Created
astropy.visualization
module and added functionality relating to image normalization (i.e. stretching and scaling) as well as a new scriptfits2bitmap
that can produce a bitmap image from a FITS file. [#3201] - Added dictionary
astropy.visualization.mpl_style.astropy_mpl_style
which can be used to set a uniform plotstyle specifically for tutorials that is improved compared to matplotlib defaults. [#2719, #2787, #3200]
astropy.wcs¶
wcslib
has been upgraded to version 4.25. This brings a single new feature:equinox
andradesys
will now be given default values conforming with the WCS specification ifEQUINOXa
andRADESYSa
, respectively, are not present in the header.- The minimum required version of
wcslib
is now 4.24. [#2503] - Added a new function
wcs_to_celestial_frame
that can be used to find the astropy.coordinates celestial frame corresponding to a particular WCS. [#2730] astropy.wcs.WCS.compare
now supports atolerance
keyword argument to allow for approximate comparison of floating-point values. [#2503]- added
pixel_scale_matrix
,celestial
,is_celestial
, andhas_celestial
convenience attributes. Addedproj_plane_pixel_scales
,proj_plane_pixel_area
, andnon_celestial_pixel_scales
utility functions for retrieving WCS pixel scale and area information [#2832, #3304] - Added two functions
pixel_to_skycoord
andskycoord_to_pixel
that make it easy to convert between SkyCoord objects and pixel coordinates. [#2885] all_world2pix
now uses a much more sophisticated and complete algorithm to iteratively compute the inverse WCS transform. [#2816]- Add ability to use
WCS
object to define projections in Matplotlib, using theWCSAxes
package. [#3183] - Added
is_proj_plane_distorted
for testing if pixels are distorted. [#3329]
API Changes¶
astropy.coordinates¶
- Subclasses of
BaseCoordinateFrame
which define a customrepr
should be aware of the format expected inSkyCoord.__repr__()
, which changed in this release. [#2704, #2882] - The
CartesianPoints
class (deprecated in v0.4) has now been removed. [#2990] - The previous
astropy.coordinates.builtin_frames
module is now a subpackage. Everything that was in theastropy.coordinates.builtin_frames
module is still accessible from the new package, but the classes are now in separate modules. This should have no direct impact at the user level. [#3120] - Support for passing a frame as a positional argument in the
SkyCoord
class has now been deprecated, except in the case where a frame with data is passed as the sole positional argument. [#3152] - Improved
__repr__
of coordinate objects representing a single coordinate point for the sake of easier copy/pasting. [#3350]
astropy.cosmology¶
- The functional interface to the cosmological routines as well as
set_current
andget_current
(deprecated in v0.4) have now been removed. [#2990]
astropy.io.ascii¶
- Added a new argument to
htmldict
in the HTML reader namedparser
, which allows the user to specify which parser BeautifulSoup should use as a backend. [#2815] - Add
FixedWidthTwoLine
reader to guessing. This will allows to read tables that a copied from screen output likeprint my_table
to be read automatically. Discussed in #3025 and #3099 [#3109]
astropy.io.fits¶
- A new optional argument
cache
has been added toastropy.io.fits.open()
. When opening a FITS file from a URL,cache
is a boolean value specifying whether or not to save the file locally in Astropy’s download cache (True
by default). [#3041]
astropy.modeling¶
- Model classes should now specify
inputs
andoutputs
class attributes instead of the oldn_inputs
andn_outputs
. These should be tuples providing human-readable labels for all inputs and outputs of the model. The length of the tuple indicates the numbers of inputs and outputs. See “What’s New in Astropy 1.0” for more details. [#2835] - It is no longer necessary to include
__init__
or__call__
definitions inModel
subclasses if all they do is wrap the super-method in order to provide a nice call signature to the docs. Theinputs
class attribute is now used to generate a nice call signature, so these methods should only be overridden byModel
subclasses in order to provide new functionality. [#2835] - Most models included in Astropy now have sensible default values for most
or all of their parameters. Call
help(ModelClass)
on any model to check what those defaults are. Most of them time they should be overridden, but some of them are useful (for example spatial offsets are always set at the origin by default). Another rule of thumb is that, where possible, default parameters are set so that the model is a no-op, or close to it, by default. [#2932] - The
Model.inverse
method has been changed to a property, so that now accessingmodel.inverse
on a model returns a new model that implements that model’s inverse, and callingmodel.inverse(...)`
on some independent variable computes the value of the inverse (similar to what the oldModel.invert()
method was meant to do). [#3024] - The
Model.invert()
method has been removed entirely (it was never implemented and there should not be any existing code that relies on it). [#3024] custom_model_1d
is deprecated in favor of the newcustom_model
(see “New Features” above). [#1763]- The
Model.param_dim
property (deprecated in v0.4) has now been removed. [#2990] - The
Beta1D
andBeta2D
models have been renamed toMoffat1D
andMoffat2D
. [#3029]
astropy.nddata¶
flags
,shape
,size
,dtype
andndim
properties removed fromastropy.nddata.NDData
. [#2905]- Arithmetic operations, uncertainty propagation, slicing and automatic
conversion to a numpy array removed from
astropy.nddata.NDData
. The classastropy.nddata.NDDataArray
is functionally equivalent to the oldNDData
. [#2905]
astropy.table¶
- The
Column.units
property (deprecated in v0.3) has now been removed. [#2990] - The
Row.data
andTable._data
attributes have been deprecated related to the change in Table implementation. They are replaced byRow.as_void()
andTable.as_array()
methods, respectively. [#2790] - The
Table.create_mask
method has been removed. This undocumented method was a development orphan and would cause corruption of the table if called. [#2790] - The return type for integer item access to a Column (e.g. col[12] or
t[‘a’][12]) is now always a numpy scalar, numpy
ndarray
, or numpyMaskedArray
. Previously if the column was multidimensional then a Column object would be returned. [#3095] - The representation of Table and Column objects has been changed to be formatted similar to the print output. [#3239]
astropy.time¶
astropy.units¶
- Support for VOUnit has been updated to be compliant with version 1.0 of the standard. This means that some VOUnit strings that were rejected before are now acceptable. [#2901] Notably:
- SI prefixes are supported on most units
- Binary prefixes are supported on “bits” and “bytes”
- Custom units can be defined “inline” by placing them between single quotes.
Unit.get_converter
has been deprecated. It is not strictly necessary for end users, and it was confusing due to lack of support forQuantity
objects. [#3456]
astropy.utils¶
Some members of
astropy.utils.misc
were moved into new submodules. Specifically:deprecated
,deprecated_attribute
, andlazyproperty
->astropy.utils.decorators
find_current_module
,find_mod_objs
->astropy.utils.introspection
All of these functions can be imported directly from
astropy.utils
which should be preferred over referencing individual submodules ofastropy.utils
. [#2857]The ProgressBar.iterate class method (deprecated in v0.3) has now been removed. [#2990]
Updated
astropy/utils/console.py
ProgressBar() module to display output to IPython notebook with the addition of aninteractive
kwarg. [#2658, #2789]
Bug Fixes¶
astropy.convolution¶
astropy.convolution.discretize_model
now handles arbitrary callables correctly [#2274].
astropy.coordinates¶
Angle.to_string
now outputs unicode arrays instead of object arrays. [#2981]SkyCoord.to_string
no longer gives an error when used with an array coordinate with more than one dimension. [#3340]- Fixed support for subclasses of
UnitSphericalRepresentation
andSphericalRepresentation
[#3354, #3366] - Fixed latex display of array angles in IPython notebook. [#3480]
astropy.io.ascii¶
- In the
CommentedHeader
thedata_start
parameter now defaults to0
, which is the first uncommented line. Discussed in #2692. [#3054] - Position lines in
FixedWidthTwoLine
reader could consist of many characters. Now, only one character in addition to the delimiter is allowed. This bug was discovered as part of [#3109] - The IPAC table writer now consistently uses the
fill_values
keyword to specify the output null values. Previously the behavior was inconsistent or incorrect. [#3259] - The IPAC table reader now correctly interprets abbreviated column types. [#3279]
- Tables that look almost, but not quite like DAOPhot tables could cause guessing to fail. [#3342]
astropy.io.fits¶
- Fixed the problem in
fits.open
of some filenames with colon (:
) in the name being recognized as URLs instead of file names. [#3122] - Setting
memmap=True
infits.open
and related functions now raises a ValueError if opening a file in memory-mapped mode is impossible. [#2298] - CONTINUE cards no longer end the value of the final card in the series with an ampersand, per the specification of the CONTINUE card convention. [#3282]
- Fixed a crash that occurred when reading an ASCII table containing zero-precision floating point fields. [#3422]
- When a float field for an ASCII table has zero-precision a decimal point (with no digits following it) is still written to the field as long as there is space for it, as recommended by the FITS standard. This makes it less ambiguous that these columns should be interpreted as floats. [#3422]
astropy.logger¶
- Fix a bug that occurred when displaying warnings that produced an error
message
dictionary changed size during iteration
. [#3353]
astropy.modeling¶
- Fixed a bug in
SLSQPLSQFitter
where themaxiter
argument was not passed correctly to the optimizer. [#3339]
astropy.table¶
- Fix a problem where
table.hstack
fails to stack multiple references to the same table, e.g.table.hstack([t, t])
. [#2995] - Fixed a problem where
table.vstack
andtable.hstack
failed to stack a single table, e.g.table.vstack([t])
. [#3313] - Fix a problem when doing nested iterators on a single table. [#3358]
- Fix an error when an empty list, tuple, or ndarray is used for item access within a table. This now returns the table with no rows. [#3442]
astropy.time¶
astropy.units¶
Added a
latex_inline
unit format that returns the units in LaTeX math notation with negative exponents instead of fractions [#2622].When using a unit that is deprecated in a given unit format, non-deprecated alternatives will be suggested. [#2806] For example:
>>> import astropy.units as u >>> u.Unit('Angstrom', format='fits') WARNING: UnitsWarning: The unit 'Angstrom' has been deprecated in the FITS standard. Suggested: nm (with data multiplied by 0.1). [astropy.units.format.utils]
astropy.utils¶
Other Changes and Additions¶
- The bundled copy of astropy-helpers has been updated to v1.0. [#3515]
- Updated
astropy.extern.configobj
to Version 5. Version 5 usessix
and the same code covers both Python 2 and Python 3. [#3149]
astropy.coordinates¶
astropy.io.fits¶
astropy.table¶
- Sped up setting of
Column
slices by an order of magnitude. [#2994, #3020] - Updated the bundled
six
module to version 1.7.3 and made 1.7.3 the minimum acceptable version ofsix
. [#2814] - The version of ERFA included with Astropy is now v1.1.1 [#2971]
- The code base is now fully Python 2 and 3 compatible and no longer requires 2to3. [#2033]
- funcsigs is included in utils.compat, but defaults to the inspect module components where available (3.3+) [#3151].
- The list of modules displayed in the pytest header can now be customized. [#3157]
- jinja2>=2.7 is now required to build the source code from the git repository, in order to allow the ERFA wrappers to be generated. [#3166]
0.4.5 (2015-02-16)¶
0.4.4 (2015-01-21)¶
Bug Fixes¶
0.4.3 (2015-01-15)¶
Bug Fixes¶
astropy.coordinates¶
- The
Distance
class has been fixed to no longer rely on the deprecated cosmology functions. [#2991] - Ensure
float32
values can be used in coordinate representations. [#2983] - Fix frame attribute inheritance in
SkyCoord.transform_to()
method so that the default attribute value (e.g. equinox) for the destination frame gets used if no corresponding value was explicitly specified. [#3106] Angle
accepts hours:mins or deg:mins initializers (without seconds). In these cases float minutes are also accepted. [#2843]astropy.coordinates.SkyCoord
objects are now copyable. [#2888]astropy.coordinates.SkyCoord
object attributes are now immutable. It is still technically possible to change the internal data for an array-valued coordinate object but this leads to inconsistencies [#2889] and should not be done. [#2888]
astropy.io.ascii¶
astropy.io.fits¶
astropy.modeling¶
- Fixed a test failure on Debian/PowerPC and Debian/s390x. [#2708]
- Fixed crash in evaluating models that have more outputs than inputs–this
case may not be handled as desired for all conceivable models of this
format (some may have to implement custom
prepare_inputs
andprepare_outputs
methods). But as long as all outputs can be assumed to have a shape determined from the broadcast of all inputs with all parameters then this can be used safely. [#3250]
astropy.table¶
- Fix a bug that caused join to fail for multi-dimensional columns. [#2984]
- Fix a bug where MaskedColumn attributes which had been changed since the object was created were not being carried through when slicing. [#3023]
- Fix a bug that prevented initializing a table from a structured array with multi-dimensional columns with copy=True. [#3034]
- Fixed unnecessarily large unicode columns when instantiating a table from row data on Python 3. [#3052]
- Improved the warning message when unable to aggregate non-numeric columns. [#2700]
astropy.units¶
- Operations on quantities with incompatible types now raises a much
more informative
TypeError
. [#2934] Quantity.tolist
now overrides thendarray
method to give aNotImplementedError
(by renaming the previouslist
method). [#3050]Quantity.round
now always returns aQuantity
(previously it returned anndarray
fordecimals>0
). [#3062]- Ensured
np.squeeze
always returns aQuantity
(it only worked if no dimensions were removed). [#3045] - Input to
Quantity
with aunit
attribute no longer can get mangled withcopy=False
. [#3051] - Remove trailing space in
__format__
calls for dimensionless quantities. [#3097] - Comparisons between units and non-unit-like objects now works correctly. [#3108]
- Units with fractional powers are now correctly multiplied together by using rational arithmetic. [#3121]
- Removed a few entries from spectral density equivalencies which did not make sense. [#3153]
astropy.utils¶
astropy.wcs¶
0.4.2 (2014-09-23)¶
Bug Fixes¶
astropy.coordinates¶
Angle
accepts hours:mins or deg:mins initializers (without seconds). In these cases float minutes are also accepted.- The
repr
for coordinate frames now displays the frame attributes (ex: ra, dec) in a consistent order. It should be noted that as part of this fix, theBaseCoordinateFrame.get_frame_attr_names()
method now returns anOrderedDict
instead of just adict
. [#2845]
astropy.io.fits¶
- Fixed a crash when reading scaled float data out of a FITS file that was
loaded from a string (using
HDUList.fromfile
) rather than from a file. [#2710] - Fixed a crash when reading data from an HDU whose header contained in invalid value for the BLANK keyword (e.g., a string value instead of an integer as required by the FITS Standard). Invalid BLANK keywords are now warned about, but are otherwise ignored. [#2711]
- Fixed a crash when reading the header of a tile-compressed HDU if that
header contained invalid duplicate keywords resulting in a
KeyError
[#2750] - Fixed crash when reading gzip-compressed FITS tables through the Astropy
Table
interface. [#2783] - Fixed corruption when writing new FITS files through to gzipped files. [#2794]
- Fixed crash when writing HDUs made with non-contiguous data arrays to file-like objects. [#2794]
- It is now possible to create
astropy.io.fits.BinTableHDU
objects with a table with zero rows. [#2916]
astropy.io.misc¶
- Fixed a bug that prevented h5py
Dataset
objects from being automatically recognized byTable.read
. [#2831]
astropy.table¶
- Fixed reference cycle in tables that could prevent
Table
objects from being freed from memory. [#2879] - Fixed an issue where
Table.pprint()
did not print the header tostdout
whenstdout
is redirected (say, to a file). [#2878] - Fixed printing of masked values when a format is specified. [#1026]
- Ensured that numpy ufuncs that return booleans return plain
ndarray
instances, just like the comparison operators. [#2963]
Other Changes and Additions¶
- Fixed a couple issues with files being inappropriately included and/or excluded from the source archive distributions of Astropy. [#2843, #2854]
- As part of fixing the fact that masked elements of table columns could not be
printed when a format was specified, the column format string options were
expanded to allow simple specifiers such as
'5.2f'
. [#2898] - Ensure numpy 1.9 is supported. [#2917]
- Ensure numpy master is supported, by making
np.cbrt
work with quantities. [#2937]
0.4.1 (2014-08-08)¶
Bug Fixes¶
astropy.config¶
Fixed a bug where an unedited configuration file from astropy 0.3.2 would not be correctly identified as unedited. [#2772] This resulted in the warning:
WARNING: ConfigurationChangedWarning: The configuration options in astropy 0.4 may have changed, your configuration file was not updated in order to preserve local changes. A new configuration template has been saved to '~/.astropy/config/astropy.0.4.cfg'. [astropy.config.configuration]
Fixed the error message that is displayed when an old configuration item has moved. Before, the destination section was wrong. [#2772]
Added configuration settings for
io.fits
,io.votable
andtable.jsviewer
that were missing from the configuration file template. [#2772]The configuration template is no longer rewritten on every import of astropy, causing race conditions. [#2805]
astropy.coordinates¶
astropy.io.misc¶
- An existing table within an HDF5 file can be overwritten without affecting
other datasets in the same HDF5 file by simultaneously using
overwrite=True
andappend=True
arguments to theTable.write
method. [#2624]
astropy.logger¶
- Fixed a crash that could occur in rare cases when (such as in bundled
apps) where submodules of the
email
package are not importable. [#2671]
astropy.nddata¶
astropy.nddata.NDData()
no longer raises aValueError
when passed a numpy masked array which has no masked entries. [#2784]
astropy.table¶
- When saving a table to a FITS file containing a unit that is not supported by the FITS standard, a warning rather than an exception is raised. [#2797]
astropy.units¶
astropy.utils¶
Other Changes and Additions¶
- Bundled copy of astropy-helpers upgraded to v0.4.1. [#2825]
- General improvements to documentation and docstrings [#2722, #2728, #2742]
- Made it easier for third-party packagers to have Astropy use their own
version of the
six
module (so long as it meets the minimum version requirement) and remove the copy bundled with Astropy. See the astropy/extern/README file in the source tree. [#2623]
0.4 (2014-07-16)¶
New Features¶
astropy.convolution¶
- Changed the input parameter in
Gaussian1DKernel
andGaussian2DKernel
fromwidth
tostddev
[#2085].
astropy.coordinates¶
- The coordinates package has undergone major changes to implement APE5 . These include backwards-incompatible changes, as the underlying framework has changed substantially. See the APE5 text and the package documentation for more details. [#2422]
- A
position_angle
method has been added to the newSkyCoord
. [#2487] - Updated
Angle.dms
andAngle.hms
to returnnamedtuple
-s instead of regular tuples, and addedAngle.signed_dms
attribute that gives the absolute value of thed
,m
, ands
along with the sign. [#1988] - By default,
Distance
objects are now required to be positive. To allow negative values, setallow_negative=True
in theDistance
constructor when creating aDistance
instance. Longitude
(resp.Latitude
) objects cannot be used any more to initialize or setLatitude
(resp.Longitude
) objects. An explicit conversion toAngle
is now required. [#2461]- The deprecated functions for pre-0.3 coordinate object names like
ICRSCoordinates
have been removed. [#2422] - The
rotation_matrix
andangle_axis
functions inastropy.coordinates.angles
were made more numerically consistent and are now tested explicitly [#2619]
astropy.cosmology¶
- Added
z_at_value
function to find the redshift at which a cosmology function matches a desired value. [#1909] - Added
FLRW.differential_comoving_volume
method to give the differential comoving volume at redshift z. [#2103] - The functional interface is now deprecated in favor of the more-explicit use of methods on cosmology objects. [#2343]
- Updated documentation to reflect the removal of the functional interface. [#2507]
astropy.io.ascii¶
- The
astropy.io.ascii
output formatslatex
andaastex
accept a dictionary calledlatex_dict
to specify options for LaTeX output. It is now possible to specify the table alignment within the text via thetablealign
keyword. [#1838] - If
header_start
is specified in a call toascii.get_reader
or any method that callsget_reader
(e.g.ascii.read
) butdata_start
is not specified at the same time, thendata_start
is calculated so that the data starts after the header. Before this, the default was that the header line was read again as the first data line [#855 and #1844]. - A new
csv
format was added as a convenience for handling CSV (comma- separated values) data. [#1935] This format also recognises rows with an inconsistent number of elements. [#1562] - An option was added to guess the start of data for CDS format files when they do not strictly conform to the format standard. [#2241]
- Added an HTML reader and writer to the
astropy.io.ascii
package. Parsing requires the installation of BeautifulSoup and is therefore an optional feature. [#2160] - Added support for inputting column descriptions and column units
with the
io.ascii.SExtractor
reader. [#2372] - Allow the use of non-local ReadMe files in the CDS reader. [#2329]
- Provide a mechanism to select how masked values are printed. [#2424]
- Added support for reading multi-aperture daophot file. [#2656]
astropy.io.fits¶
- Included a new command-line script called
fitsheader
to display the header(s) of a FITS file from the command line. [#2092] - Added new verification options
fix+ignore
,fix+warn
,fix+exception
,silentfix+ignore
,silentfix+warn
, andsilentfix+exception
which give more control over how to report fixable errors as opposed to unfixable errors.
astropy.modeling¶
- Prototype implementation of fitters that treat optimization algorithms separately from fit statistics, allowing new fitters to be created by mixing and matching optimizers and statistic functions. [#1914]
- Slight overhaul to how inputs to and outputs from models are handled with respect to array-valued parameters and variables, as well as sets of multiple models. See the associated PR and the modeling section of the v0.4 documentation for more details. [#2634]
- Added a new
SimplexLSQFitter
which uses a downhill simplex optimizer with a least squares statistic. [#1914] - Changed
Gaussian2D
model such thattheta
now increases counterclockwise. [#2199] - Replaced the
MatrixRotation2D
model with a new model called simplyRotation2D
which requires only an angle to specify the rotation. The newRotation2D
rotates in a counter-clockwise sense whereas the oldMatrixRotation2D
increased the angle clockwise. [#2266, #2269] - Added a new
AffineTransformation2D
model which serves as a replacement for the capability ofMatrixRotation2D
to accept an arbitrary matrix, while also adding a translation capability. [#2269] - Added
GaussianAbsorption1D
model. [#2215] - New
Redshift
model [#2176].
astropy.stats¶
- Added flat prior to binom_conf_interval and binned_binom_proportion
- Change default in
sigma_clip
fromnp.median
tonp.ma.median
. [#2582]
astropy.sphinx¶
- Note, the following new features are included in astropy-helpers as well:
- The
automodapi
andautomodsumm
extensions now include sphinx configuration options to write out whatautomodapi
andautomodsumm
generate, mainly for debugging purposes. [#1975, #2022] - Reference documentation now shows functions/class docstrings at the inteded user-facing API location rather than the actual file where the implementation is found. [#1826]
- The
automodsumm
extension configuration was changed to generate documentation of class__call__
member functions. [#1817, #2135] automodapi
andautomodsumm
now have an:allowed-package-names:
option that make it possible to document functions and classes that are in a different namespace. [#2370]
astropy.table¶
- Improved grouped table aggregation by using the numpy
reduceat()
method when possible. This can speed up the operation by a factor of at least 10 to 100 for large unmasked tables and columns with relatively small group sizes. [#2625] - Allow row-oriented data input using a new
rows
keyword argument. [#850] - Allow subclassing of
Table
and the component classesRow
,Column
,MaskedColumn
,TableColumns
, andTableFormatter
. [#2287] - Fix to allow numpy integer types as valid indices into tables in Python 3.x [#2477]
- Remove transition code related to the order change in
Column
andMaskedColumn
argumentsname
anddata
from Astropy 0.2 to 0.3. [#2511] - Change HTML table representation in IPython notebook to show all table columns instead of restricting to 80 column width. [#2651]
astropy.time¶
- Mean and apparent sidereal time can now be calculated using the
sidereal_time
method [#1418]. - The time scale now defaults to UTC if no scale is provided. [#2091]
TimeDelta
objects can have all scales but UTC, as well as, for consistency with time-like quantities, undefined scale (where the scale is taken from the object one adds to or subtracts from). This allows, e.g., to work consistently in TDB. [#1932]Time
now supports ISO format strings that end in “Z”. [#2211, #2203]
astropy.units¶
- Support for the unit format Office of Guest Investigator Programs (OGIP) FITS files has been added. [#377]
- The
spectral
equivalency can now handle angular wave number. [#1306 and #1899] - Added
one
as a shorthand fordimensionless_unscaled
. [#1980] - Added
dex
anddB
units. [#1628] - Added
temperature()
equivalencies to support conversion between Kelvin, Celsius, and Fahrenheit. [#2209] - Added
temperature_energy()
equivalencies to support conversion between electron-volt and Kelvin. [#2637] - The runtime of
astropy.units.Unit.compose
is greatly improved (by a factor of 2 in most cases) [#2544] - Added
electron
unit. [#2599]
astropy.vo¶
astropy.wcs¶
- astropy now requires wcslib version 4.23. The version of wcslib included with astropy has been updated to version 4.23.
- Bounds checking is now performed on native spherical
coordinates. Any out-of-bounds values will be returned as
NaN
, and marked in thestat
array, if using the low-levelwcslib
interface such asastropy.wcs.Wcsprm.p2s
. [#2107] - A new method,
astropy.wcs.WCS.compare()
, compares two wcsprm structs for equality with varying degrees of strictness. [#2361] - New
astropy.wcs.utils
module, with a handful of tools for manipulating WCS objects, including dropping, swapping, and adding axes.
Misc¶
- Includes the new astropy-helpers package which separates some of Astropy’s
build, installation, and documentation infrastructure out into an
independent package, making it easier for Affiliated Packages to depend on
these features. astropy-helpers replaces/deprecates some of the submodules
in the
astropy
package (see API Changes below). See also APE 4 for more details on the motivation behind and implementation of astropy-helpers. [#1563]
API Changes¶
astropy.config¶
- The configuration system received a major overhaul, as part of APE3. It is no longer possible to save configuration items from Python, but instead users must edit the configuration file directly. The locations of configuration items have moved, and some have been changed to science state values. The old locations should continue to work until astropy 0.5, but deprecation warnings will be displayed. See the Configuration transition docs for a detailed description of the changes and how to update existing code. [#2094]
astropy.io.fits¶
The
astropy.io.fits.new_table
function is now fully deprecated (though will not be removed for a long time, considering how widely it is used).Instead please use the more explicit
BinTableHDU.from_columns
to create a new binary table HDU, and the similarTableHDU.from_columns
to create a new ASCII table. These otherwise accept the same arguments asnew_table
which is now just a wrapper for these.The
.fromstring
classmethod of each HDU type has been simplified such that, true to its namesake, it only initializes an HDU from a string containing its header and data.Fixed an issue where header wildcard matching (for example
header['DATE*']
) can be used to match any characters that might appear in a keyword. Previously this only matched keywords containing characters in the set[0-9A-Za-z_]
. Now this can also match a hyphen-
and any other characters, as some conventions likeHIERARCH
and record-valued keyword cards allow a wider range of valid characters than standard FITS keywords.This will be the last release to support the following APIs that have been marked deprecated since Astropy v0.1/PyFITS v3.1:
The
CardList
class, which was part of the old header implementation.The
Card.key
attribute. UseCard.keyword
instead.The
Card.cardimage
andCard.ascardimage
attributes. Use simplyCard.image
orstr(card)
instead.The
create_card
factory function. Simply use the normalCard
constructor instead.The
create_card_from_string
factory function. UseCard.fromstring
instead.The
upper_key
function. UseCard.normalize_keyword
method instead (this is not unlikely to be used outside of PyFITS itself, but it was technically public API).The usage of
Header.update
withHeader.update(keyword, value, comment)
arguments.Header.update
should only be used analogously todict.update
. UseHeader.set
instead.The
Header.ascard
attribute. UseHeader.cards
instead for a list of all theCard
objects in the header.The
Header.rename_key
method. UseHeader.rename_keyword
instead.The
Header.get_history
method. Useheader['HISTORY']
instead (normal keyword lookup).The
Header.get_comment
method. Useheader['COMMENT']
instead.The
Header.toTxtFile
method. Useheader.totextfile
instead.The
Header.fromTxtFile
method. UseHeader.fromtextfile
instead.The
tdump
andtcreate
functions. Usetabledump
andtableload
respectively.The
BinTableHDU.tdump
andtcreate
methods. UseBinTableHDU.dump
andBinTableHDU.load
respectively.The
txtfile
argument to theHeader
constructor. UseHeader.fromfile
instead.The
startColumn
andendColumn
arguments to theFITS_record
constructor. These are unlikely to be used by any user code.These deprecated interfaces will be removed from the development version of Astropy following the v0.4 release (they will still be available in any v0.4.x bugfix releases, however).
astropy.modeling¶
The method computing the derivative of the model with respect to parameters was renamed from
deriv
tofit_deriv
. [#1739]ParametricModel
and the associatedParametric1DModel
andParametric2DModel
classes have been renamedFittableModel
,Fittable1DModel
, andFittable2DModel
respectively. The baseModel
class has subsumed the functionality of the oldParametricModel
class so that all models support parameter constraints. The only distinction ofFittableModel
is that anything which subclasses it is assumed “safe” to use with Astropy fitters. [#2276]NonLinearLSQFitter
has been renamedLevMarLSQFitter
to emphasise that it uses the Levenberg-Marquardt optimization algorithm with a least squares statistic function. [#1914]The
SLSQPFitter
class has been renamedSLSQPLSQFitter
to emphasize that it uses the Sequential Least Squares Programming optimization algorithm with a least squares statistic function. [#1914]The
Fitter.errorfunc
method has been renamed to the more generalFitter.objective_function
. [#1914]
astropy.nddata¶
astropy.sphinx¶
- Use of the
astropy.sphinx
module is deprecated; all new development of this module is inastropy_helpers.sphinx
which should be used instead (therefore documentation builds that made use of any of the utilities inastropy.sphinx
now haveastropy_helpers
as a documentation dependency).
astropy.table¶
- The default table printing function now shows a table header row for units if any columns have the unit attribute set. [#1282]
- Before, an unmasked
Table
was automatically converted to a masked table if generated from a masked Table or aMaskedColumn
. Now, this conversion is only done if explicitly requested or if any of the input values is actually masked. [#1185] - The repr() function of
astropy.table.Table
now shows the units if any columns have the unit attribute set. [#2180] - The semantics of the config options
table.max_lines
andtable.max_width
has changed slightly. If these values are not set in the config file, astropy will try to determine the size automatically from the terminal. [#2683]
astropy.time¶
astropy.units¶
Quantity
now converts input to float by default, as this is physically most sensible for nearly all units [#1776].Quantity
comparisons with==
or!=
now always returnTrue
orFalse
, even if units do not match (for which case aUnitsError
used to be raised). [#2328]- Applying
float
orint
to aQuantity
now works for all dimensionless quantities; they are automatically converted to unscaled dimensionless. [#2249] - The exception
astropy.units.UnitException
, which was deprecated in astropy 0.2, has been removed. Useastropy.units.UnitError
instead [#2386] - Initializing a
Quantity
with a valid number/array with aunit
attribute now interprets that attribute as the units of the input value. This makes it possible to initialize aQuantity
from an AstropyTable
column and have it correctly pick up the units from the column. [#2486]
astropy.wcs¶
calcFootprint
was deprecated. It is replaced bycalc_footprint
. An optional boolean keywordcenter
was added tocalc_footprint
. It controls whether the centers or the corners of the pixels are used in the computation. [#2384]astropy.wcs.WCS.sip_pix2foc
andastropy.wcs.WCS.sip_foc2pix
formerly did not conform to theSIP
standard:CRPIX
was added to thefoc
result so that it could be used as input to “core FITS WCS”. As of astropy 0.4,CRPIX
is no longer added to the result, so thefoc
space is correct as defined in the SIP convention. [#2360]astropy.wcs.UnitConverter
, which was deprecated in astropy 0.2, has been removed. Use theastropy.units
module instead. [#2386]- The following methods on
astropy.wcs.WCS
, which were deprecated in astropy 0.1, have been removed [#2386]: all_pix2sky
->all_pix2world
wcs_pix2sky
->wcs_pix2world
wcs_sky2pix
->wcs_world2pix
- The
naxis1
andnaxis2
attributes and theget_naxis
method ofastropy.wcs.WCS
, which were deprecated in astropy 0.2, have been removed. Use the shape of the underlying FITS data array instead. [#2386]
Misc¶
- The
astropy.setup_helpers
andastropy.version_helpers
modules are deprecated; any non-critical fixes and development to those modules should be inastropy_helpers
instead. Packages that use these modules in theirsetup.py
should depend onastropy_helpers
following the same pattern as in the Astropy package template.
Bug Fixes¶
astropy.cosmology¶
astropy.io.ascii¶
astropy.io.ascii.read
would fail to read lists of strings where some of the strings consisted of just a newline (“n”). [#2648]
astropy.io.fits¶
- Use NaN for missing values in FITS when using Table.write for float columns. Earlier the default fill value was close to 1e20.[#2186]
- Fixes for checksums on 32-bit platforms. Results may be different if writing or checking checksums in “nonstandard” mode. [#2484]
- Additional minor bug fixes ported from PyFITS. [#2575]
astropy.io.votable¶
astropy.nddata¶
- Indexing
NDData
in a way that results in a single element returns that element. [#2170] - Change construction of result of arithmetic and unit conversion to allow subclasses to require the presence of attribute like unit. [#2300]
- Scale uncertainties to correct units in arithmetic operations and unit conversion. [#2393]
- Ensure uncertainty and mask members are copied in arithmetic and convert_unit_to. [#2394]
- Mask result of arithmetic if either of the operands is masked. [#2403]
- Copy all attributes of input object if
astropy.nddata.NDData
is initialized with anNDData
object. [#2406] - Copy
flags
to new object inconvert_unit_to
. [#2409] - Result of
NDData
arithmetic makes a copy of any WCS instead of using a reference. [#2410] - Fix unit handling for multiplication/division and use
astropy.units.Quantity
for units arithmetic. [#2413] - A masked
NDData
is now converted to a masked array when used in an operation or ufunc with a numpy array. [#2414] - An unmasked
NDData
now uses an internal representation of its mask state thatnumpy.ma
expects so that anNDData
behaves as an unmasked array. [#2417]
astropy.table¶
- The
astropy.table.Column
object can now use both functions and callable objects as formats. [#2313] - Fixed a problem on 64 bit windows that caused errors “expected ‘DTYPE_t’ but got ‘long long’” [#2490]
- Fix initialisation of
TableColumns
with lists or tuples. [#2647] - Fix removal of single column using
remove_columns
. [#2699] - Fix a problem that setting a row element within a masked table did not update the corresponding table element. [#2734]
astropy.time¶
- Correct UT1->UTC->UT1 round-trip being off by 1 second if UT1 is on a leap second. [#2077]
astropy.units¶
Quantity.copy
now behaves identically tondarray.copy
, and thus supports theorder
argument (for numpy >=1.6). [#2284]- Composing base units into identical composite units now works. [#2382]
- Creating and composing/decomposing units is now substantially faster [#2544]
Quantity
objects now are able to be assigned NaN [#2695]
astropy.wcs¶
- Astropy now requires wcslib version 4.23. The version of wcslib included with astropy has been updated to version 4.23.
- Bug fixes in the projection routines: in
hpxx2s
[the cartesian-to-spherical operation of theHPX
projection] relating to bounds checking, bug introduced at wcslib 4.20; inparx2s
and molx2s`` [the cartesion-to-spherical operation of thePAR
andMOL
projections respectively] relating to setting the stat vector; inhpxx2s
relating to implementation of the vector API; and inxphx2s
relating to setting an out-of-bounds value of phi. - In the
PCO
projection, use alternative projection equations for greater numerical precision near theta == 0. In theCOP
projection, return an exact result for theta at the poles. Relaxed the tolerance for bounds checking a little inSFL
projection. - Fix a bug allocating insufficient memory in
astropy.wcs.WCS.sub
[#2468] - A new method,
Wcsprm.bounds_check
(corresponding to wcslib’swcsbchk
) has been added to control what bounds checking is performed by wcslib. WCS.to_header
will now raise a more meaningful exception when the WCS information is invalid or inconsistent in some way. [#1854]- In
WCS.to_header
,RESTFRQ
andRESTWAV
are no longer rewritten if zero. [#2468] - In
WCS.to_header
, floating point values will now always be written with an exponent or fractional part, i.e..0
being appended if necessary to acheive this. [#2468] - If the C extension for
astropy.wcs
was not built or fails to import for any reason,import astropy.wcs
will result in anImportError
, rather than getting obscure errors once theastropy.wcs
is used. [#2061] - When the C extension for
astropy.wcs
is built using a version ofwscslib
already present in the system, the package does not try to installwcslib
headers underastropy/wcs/include
. [#2536] - Fixes an unresolved external symbol error in the
astropy.wcs._wcs
C extension on Microsoft Windows when built with a Microsoft compiler. [#2478]
Misc¶
- Running the test suite with
python setup.py test
now works if the path to the source contains spaces. [#2488] - The version of ERFA included with Astropy is now v1.1.0 [#2497]
- Removed deprecated option from travis configuration and force use of wheels rather than allowing build from source. [#2576]
- The short option
-n
to run tests in parallel was broken (conflicts with the distutils built-in option of “dry-run”). Changed to-j
. [#2566]
Other Changes and Additions¶
- python setup.py test –coverage will now give more accurate
results, because the coverage analysis will include early imports of
astropy. There doesn’t seem to be a way to get this to work when
doing
import astropy; astropy.test()
, so thecoverage
keyword toastropy.test
has been removed. Coverage testing now depends only on coverage.py, notpytest-cov
. [#2112] - The included version of py.test has been upgraded to 2.5.1. [#1970]
- The included version of six.py has been upgraded to 1.5.2. [#2006]
- Where appropriate, tests are now run both with and without the
unicode_literals
option to ensure that we support both cases. [#1962] - Running the Astropy test suite from within the IPython REPL is disabled for now due to bad interaction between the test runner and IPython’s logging and I/O handler. For now, run the Astropy tests should be run in the basic Python interpreter. [#2684]
- Added support for numerical comparison of floating point values appearing in
the output of doctests using a
+FLOAT_CMP
doctest flag. [#2087] - A monkey patch is performed to fix a bug in Numpy version 1.7 and
earlier where unicode fill values on masked arrays are not
supported. This may cause unintended side effects if your
application also monkey patches
numpy.ma
or relies on the broken behavior. If unicode support of masked arrays is important to your application, upgrade to Numpy 1.8 or later for best results. [#2059] - The developer documentation has been extensively rearranged and rewritten. [#1712]
- The
human_time
function inastropy.utils
now returns strings without zero padding. [#2420] - The
bdist_dmg
command forsetup.py
has now been removed. [#2553] - Many broken API links have been fixed in the documentation, and the
nitpick
Sphinx option is now used to avoid broken links in future. [#1221, #2019, #2109, #2161, #2162, #2192, #2200, #2296, #2448, #2456, #2460, #2467, #2476, #2508, #2509]
0.3.2 (2014-05-13)¶
Bug Fixes¶
astropy.coordinates¶
- if
sep
argument is specified to be a single character insexagisimal_to_string
, it now includes seperators only between items [#2183] - Ensure comparisons involving
Distance
objects do not raise exceptions; also ensure operations that lead to units other than length returnQuantity
. [#2206, #2250] - Multiplication and division of
Angle
objects is now supported. [#2273] - Fixed
Angle.to_string
functionality so that negative angles have the correct amount of padding whenpad=True
. [#2337] - Mixing strings and quantities in the
Angle
constructor now works. For example:Angle(['1d', 1. * u.d])
. [#2398] - If
Longitude
is given aLongitude
as input, use itswrap_angle
by default [#2705]
astropy.cosmology¶
astropy.io.ascii¶
- The CDS reader in
astropy.io.ascii
can now handle multiple description lines in ReadMe files. [#2225] - When reading a table with values that generate an overflow error during type conversion (e.g. overflowing the native C long type), fall through to using string. Previously this generated an exception [#2234].
- Recognize any string with one to four dashes as null value. [#1335]
astropy.io.fits¶
- Allow pickling of
FITS_rec
objects. [#1597] - Improved behavior when writing large compressed images on OSX by removing an unnecessary check for platform architecture. [#2345]
- Fixed an issue where Astropy
Table
objects containing boolean columns were not correctly written out to FITS files. [#1953] - Several other bug fixes ported from PyFITS v3.2.3 [#2368]
- Fixed a crash on Python 2.x when writing a FITS file directly to a
StringIO.StringIO
object. [#2463]
astropy.io.registry¶
- Allow readers/writers with the same name to be attached to different classes. [#2312]
astropy.io.votable¶
- By default, floating point values are now written out using
repr
rather thanstr
to preserve precision [#2137]
astropy.modeling¶
- Fixed the
SIP
andInverseSIP
models both so that they work in the first place, and so that they return results consistent with the SIP functions inastropy.wcs
. [#2177]
astropy.units¶
astropy.utils¶
- Progress bars will now be displayed inside the IPython qtconsole. [#2230]
data.download_file()
now evaluatesREMOTE_TIMEOUT()
at runtime rather than import time. Previously, settingREMOTE_TIMEOUT
after import had no effect on the function’s behavior. [#2302]- Progressbar will be limited to 100% so that the bar does not exceed the terminal width. The numerical display can still exceed 100%, however.
astropy.vo¶
astropy.wcs¶
0.3.1 (2014-03-04)¶
Bug Fixes¶
astropy.config¶
- Fixed a bug where
ConfigurationItem.set_temp()
does not reset to default value when exception is raised withinwith
block. [#2117]
astropy.convolution¶
astropy.coordinates¶
- Fixed a bug where using
==
on two array coordinates wouldn’t work. [#1832] - Fixed bug which caused
len()
not to work for coordinate objects and added a.shape
property to get appropriately array-like behavior. [#1761, #2014] - Fixed a bug where sexagesimal notation would sometimes include exponential notation in the last field. [#1908, #1913]
CompositeStaticMatrixTransform
no longer attempts to reference the undefined variableself.matrix
during instantiation. [#1944]- Fixed pickling of
Longitude
, ensuringwrap_angle
is preserved [#1961] - Allow
sep
argument inAngle.to_string
to be empty (resulting in no separators) [#1989]
astropy.io.ascii¶
astropy.io.fits¶
- Ported all bug fixes from PyFITS 3.2.1. See the PyFITS changelog at http://pyfits.readthedocs.io/en/v3.2.1/ [#2056]
astropy.io.misc¶
- Fixed issues in the HDF5 Table reader/writer functions that occurred on Windows. [#2099]
astropy.io.votable¶
- The
write_null_values
kwarg toVOTable.to_xml
, when set toFalse
(the default) would produce non-standard VOTable files. Therefore, this functionality has been replaced by a better understanding that knows which fields in a VOTable may be left empty (onlychar
,float
anddouble
in VOTable 1.1 and 1.2, and all fields in VOTable 1.3). The kwarg is still accepted but it will be ignored, and a warning is emitted. [#1809] - Printing out a
astropy.io.votable.tree.Table
object usingrepr
orstr
now uses the pretty formatting inastropy.table
, so it’s possible to easily preview the contents of aVOTable
. [#1766]
astropy.modeling¶
astropy.table¶
- The column string representation for n-dimensional cells with only one element has been fixed. [#1522]
- Fix a problem that caused
MaskedColumn.__getitem__
to not preserve column metadata. [#1471, #1872] - With Numpy prior to version 1.6.2, tables with Unicode columns now sort correctly. [#1867]
astropy.table
can now print out tables with Unicode columns containing non-ascii characters. [#1864]- Columns can now be named with Unicode strings, as long as they contain only
ascii characters. This makes using
astropy.table
easier on Python 2 whenfrom __future__ import unicode_literals
is used. [#1864] - Allow pickling of
Table
,Column
, andMaskedColumn
objects. [#792] - Fix a problem where it was not possible to rename columns after sorting or adding a row. [#2039]
astropy.time¶
- Fix a problem where scale conversion problem in TimeFromEpoch was not showing a useful error [#2046]
- Fix a problem when converting to one of the formats
unix
,cxcsec
,gps
orplot_date
when the time scale isUT1
,TDB
orTCB
[#1732] - Ensure that
delta_ut1_utc
gets calculated when accessed directly, instead of failing and giving a rather obscure error message [#1925] - Fix a bug when computing the TDB to TT offset. The transform routine was using meters instead of kilometers for the Earth vector. [#1929]
- Increase
__array_priority__
so thatTimeDelta
can convert itself to aQuantity
also in reverse operations [#1940] - Correct hop list from TCG to TDB to ensure that conversion is possible [#2074]
astropy.units¶
Quantity
initialisation rewritten for speed [#1775]- Fixed minor string formatting issue for dimensionless quantities. [#1772]
- Fix error for inplace operations on non-contiguous quantities [#1834].
- The definition of the unit
bar
has been corrected to “1e5 Pascal” from “100 Pascal” [#1910] - For units that are close to known units, but not quite, for example due to differences in case, the exception will now include recommendations. [#1870]
- The generic and FITS unit parsers now accept multiple slashes in the unit string. There are multiple ways to interpret them, but the approach taken here is to convert “m/s/kg” to “m s-1 kg-1”. Multiple slashes are accepted, but discouraged, by the FITS standard, due to the ambiguity of parsing, so a warning is raised when it is encountered. [#1911]
- The use of “angstrom” (with a lower case “a”) is now accepted in FITS unit strings, since it is in common usage. However, since it is not officially part of the FITS standard, a warning will be issued when it is encountered. [#1911]
- Pickling unrecognized units will not raise a
AttributeError
. [#2047] astropy.units
now correctly preserves the precision of fractional powers. [#2070]- If a
Unit
orQuantity
is raised to a floating point power that is very close to a rational number with a denominator less than or equal to 10, it is converted to aFraction
object to preserve its precision through complex unit conversion operations. [#2070]
astropy.utils¶
astropy.wcs¶
astropy.wcs.WCS
,astropy.wcs.WCS.fix
andastropy.wcs.find_all_wcs
now have atranslate_units
keyword argument that is passed down toastropy.wcs.Wcsprm.fix
. This can be used to specify any unsafe translations of units from rarely used ones to more commonly used ones.Although
"S"
is commonly used to represent seconds, its translation to"s"
is potentially unsafe since the standard recognizes"S"
formally as Siemens, however rarely that may be used. The same applies to"H"
for hours (Henry), and"D"
for days (Debye).When these sorts of changes are performed, a warning is emitted. [#1854]
When a unit is “fixed” by
astropy.wcs.WCS.fix
orastropy.wcs.Wcsprm.unitfix
, it now correctly reports theCUNIT
field that was changed. [#1854]astropy.wcs.Wcs.printwcs
will no longer warn thatcdelt
is being ignored when none was present in the FITS file. [#1845]astropy.wcs.Wcsprm.set
is called from within theastropy.wcs.WCS
constructor, therefore any invalid information in the keywords will be raised from the constructor, rather than on a subsequent call to a transformation method. [#1918]Fix a memory corruption bug when using
astropy.wcs.Wcs.sub
withastropy.wcs.WCSSUB_CELESTIAL
. [#1960]Fixed the
AttributeError
exception that was raised when usingastropy.wcs.WCS.footprint_to_file
. [#1912]Fixed a
NameError
exception that was raised when usingastropy.wcs.validate
or thewcslint
script. [#2053]Fixed a bug where named WCSes may be erroneously reported as
' '
when usingastropy.wcs.validate
or thewcslint
script. [#2053]Fixed a bug where error messages about incorrect header keywords may not be propagated correctly, resulting in a “NULL error object in wcslib” message. [#2106]
Other Changes and Additions¶
- A new function,
astropy.wcs.get_include
, has been added to get the location of theastropy.wcs
C header files. [#1755] - The doctests in the
.rst
files in thedocs
folder are now tested along with the other unit tests. This is in addition to the testing of doctests in docstrings that was already being performed. Seedocs/development/testguide.rst
for more information. [#1771] - Fix a problem where import fails on Python 3 if setup.py exists in current directory. [#1877]
0.3 (2013-11-20)¶
New Features¶
General
A top-level configuration item,
unicode_output
has been added to control whether the Unicode string representation of certain objects will contain Unicode characters. For example, whenuse_unicode
isFalse
(default):>>> from astropy import units as u >>> print(unicode(u.degree)) deg
When
use_unicode
isTrue
:>>> from astropy import units as u >>> print(unicode(u.degree)) °
See handling-unicode for more information. [#1441]
astropy.utils.misc.find_api_page
is now imported into the top-level. This allows usage likeastropy.find_api_page(astropy.units.Quantity)
. [#1779]
astropy.convolution¶
astropy.coordinates¶
- Two classes
astropy.coordinates.Longitude
andastropy.coordinates.Latitude
have been added. These are derived from the newAngle
class and used for all longitude-like (RA, azimuth, galactic L) and latitude-like coordinates (Dec, elevation, galactic B) respectively. TheLongitude
class provides auto-wrapping capability andLatitude
performs bounds checking. astropy.coordinates.Distance
supports conversion to and from distance modulii. [#1472]astropy.coordinates.SphericalCoordinateBase
and derived classes now support arrays of coordinates, enabling large speed-ups for some operations on multiple coordinates at the same time. These coordinates can also be indexed using standard slicing or any Numpy-compatible indexing. [#1535, #1615]- Array coordinates can be matched to other array coordinates, finding the
closest matches between the two sets of coordinates (see the
astropy.coordinates.matching.match_coordinates_3d
andastropy.coordinates.matching.match_coordinates_sky
functions). [#1535]
astropy.cosmology¶
astropy.io.fits¶
- Added initial support for table columns containing pseudo-unsigned
integers. This is currently enabled by using the
uint=True
option when opening files; any table columns with the correct BZERO value will be interpreted and returned as arrays of unsigned integers. [#906] - Upgraded vendored copy of CFITSIO to v3.35, though backwards compatibility back to version v3.28 is maintained.
- Added support for reading and writing tables using the Q format for columns. The Q format is identical to the P format (variable-length arrays) except that it uses 64-bit integers for the data descriptors, allowing more than 4 GB of variable-length array data in a single table.
- Some refactoring of the table and
FITS_rec
modules in order to better separate the details of the FITS binary and ASCII table data structures from the HDU data structures that encapsulate them. Most of these changes should not be apparent to users (but see API Changes below).
astropy.io.votable¶
- Updated to support the VOTable 1.3 draft. [#433]
- Added the ability to look up and group elements by their utype attribute. [#622]
- The format of the units of a VOTable file can be specified using the
unit_format
parameter. Note that units are still always written out using the CDS format, to ensure compatibility with the standard.
astropy.modeling¶
- Added a new framework for representing and evaluating mathematical models and for fitting data to models. See “What’s New in Astropy 0.3” in the documentation for further details. [#493]
astropy.stats¶
- Added robust statistics functions
astropy.stats.funcs.median_absolute_deviation
,astropy.stats.funcs.biweight_location
, andastropy.stats.funcs.biweight_midvariance
. [#621] - Added
astropy.stats.funcs.signal_to_noise_oir_ccd
for computing the signal to noise ratio for source being observed in the optical/IR using a CCD. [#870] - Add
axis=int
option tostropy.stats.funcs.sigma_clip
to allow clipping along a given axis for multidimensional data. [#1083]
astropy.table¶
- New columns can be added to a table via assignment to a non-existing column by name. [#726]
- Added
join
function to perform a database-like join on two tables. This includes support for inner, left, right, and outer joins as well as metadata merging. [#903] - Added
hstack
andvstack
functions to stack two or more tables. [#937] - Tables now have a
.copy
method and include support forcopy
anddeepcopy
. [#1208] - Added support for selecting and manipulating groups within a table with
a database style
group_by
method. [#1424] - Table
read
andwrite
functions now include rudimentary support reading and writing of FITS tables via the unified reading/writing interface. [#591] - The
units
anddtypes
attributes and keyword arguments in Column, MaskedColumn, Row, and Table are now deprecated in favor of the single-tenseunit
anddtype
. [#1174] - Setting a column from a Quantity now correctly sets the unit on the Column object. [#732]
- Add
remove_row
andremove_rows
to remove table rows. [#1230] - Added a new
Table.show_in_browser
method that opens a web browser and displays the table rendered as HTML. [#1342] - New tables can now be instantiated using a single row from an existing table. [#1417]
astropy.time¶
- New
Time
objects can be instantiated from existingTime
objects (but with different format, scale, etc.) [#889] - Added a
Time.now
classmethod that returns the current UTC time, similarly to Python’sdatetime.now
. [#1061] - Update internal time manipulations so that arithmetic with Time and TimeDelta objects maintains sub-nanosecond precision over a time span longer than the age of the universe. [#1189]
- Use
astropy.utils.iers
to providedelta_ut1_utc
, so that automatic calculation of UT1 becomes possible. [#1145] - Add
datetime
format which allows converting to and from standard librarydatetime.datetime
objects. [#860] - Add
plot_date
format which allows converting to and from the date representation used when plotting dates with matplotlib via thematplotlib.pyplot.plot_date
function. [#860] - Add
gps
format (seconds since 1980-01-01 00:00:00 UTC, including leap seconds) [#1164] - Add array indexing to Time objects [#1132]
- Allow for arithmetic of multi-element and single-element Time and TimeDelta objects. [#1081]
- Allow multiplication and division of TimeDelta objects by constants and arrays, as well as changing sign (negation) and taking the absolute value of TimeDelta objects. [#1082]
- Allow comparisons of Time and TimeDelta objects. [#1171]
- Support interaction of Time and Quantity objects that represent a time interval. [#1431]
astropy.units¶
- Added parallax equivalency for length-angle. [#985]
- Added mass-energy equivalency. [#1333]
- Added a new-style format method which will use format specifiers
(like
0.03f
) in new-style format strings for the Quantity’s value. Specifiers which can’t be applied to the value will fall back to the entire string representation of the quantity. [#1383] - Added support for complex number values in quantities. [#1384]
- Added new spectroscopic equivalencies for velocity conversions (relativistic, optical, and radio conventions are supported) [#1200]
- The
spectral
equivalency now also handles wave number. - The
spectral_density
equivalency now also accepts a Quantity for the frequency or wavelength. It also handles additional flux units. - Added Brightness Temperature (antenna gain) equivalency for conversion between \(T_B\) and flux density. [#1327]
- Added percent unit, and allowed any string containing just a number to be interpreted as a scaled dimensionless unit. [#1409]
- New-style format strings can be used to set the unit output format. For
example,
"{0:latex}".format(u.km)
will print with the latex formatter. [#1462] - The
Unit.is_equivalent
method can now take a tuple. In this case, the method returnsTrue
if the unit is equivalent to any of the units listed in the tuple. [#1521] def_unit
can now take a 2-tuple of names of the form (short, long), where each entry is a list. This allows for handling strange units that might have multiple short names. [#1543]- Added
dimensionless_angles
equivalency, which allows conversion of any power of radian to dimensionless. [#1161] - Added the ability to enable set of units, or equivalencies that are used by default. Also provided context managers for these cases. [#1268]
- Imperial units are disabled by default. [#1593, #1662]
- Added an
astropy.units.add_enabled_units
context manager, which allows creating a temporary context with additional units temporarily enabled in the global units namespace. [#1662] Unit
instances now have.si
and.cgs
properties a laQuantity
. These serve as shortcuts forUnit.to_system(cgs)[0]
etc. [#1610]
astropy.vo¶
- New package added to support Virtual Observatory Simple Cone Search query and service validation. [#552]
astropy.wcs¶
astropy.utils¶
- Added a new set of utilities in
astropy.utils.timer
for analyzing the runtime of functions and making runtime predections for larger inputs. [#743] ProgressBar
andSpinner
classes can now be used directly to return generator expressions. [#771]- Added
astropy.utils.iers
which allows reading in of IERS A or IERS B bulletins and interpolation in UT1-UTC. - Added a function
astropy.utils.find_api_page
–given a class or object from theastropy
package, this will open that class’s API documentation in a web browser. [#663] - Data download functions such as
download_file
now accept ashow_progress
argument to suppress console output, and atimeout
argument. [#865, #1258]
astropy.extern.six¶
- Added six for python2/python3 compatibility
- Astropy now uses the ERFA library instead of the IAU SOFA library for
fundamental time transformation routines. The ERFA library is derived, with
permission, from the IAU SOFA library but is distributed under a BSD license.
See
license/ERFA.rst
for details. [#1293]
astropy.logger¶
- The Astropy logger now no longer catches exceptions by default, and also
only captures warnings emitted by Astropy itself (prior to this change,
following an import of Astropy, any warning got re-directed through the
Astropy logger). Logging to the Astropy log file has also been disabled by
default. However, users of Astropy 0.2 will likely still see the previous
behavior with Astropy 0.3 for exceptions and logging to file since the
default configuration file installed by 0.2 set the exception logging to be
on by default. To get the new behavior, set the
log_exceptions
andlog_to_file
configuration items toFalse
in theastropy.cfg
file. [#1331]
API Changes¶
- General
- The configuration option
utils.console.use_unicode
has been moved to the top level and renamed tounicode_output
. It now not only affects console widgets, such as progress bars, but also controls whether callingunicode
on certain classes will return a string containing unicode characters.
astropy.coordinates¶
- The
astropy.coordinates.Angle
class is now a subclass ofastropy.units.Quantity
. This means it has all of the methods of anumpy.ndarray
. [#1006] - The
astropy.coordinates.Distance
class is now a subclass ofastropy.units.Quantity
. This means it has all of the methods of anumpy.ndarray
. [#1472] - All angular units are now supported, not just
radian
,degree
andhour
, but nowarcsecond
andarcminute
as well. The object will retain its native unit, so when printing out a value initially provided in hours, itsto_string()
will, by default, also be expressed in hours. - The
Angle
class now supports arrays of angles. - To be consistent with
units.Unit
,Angle.format
has been deprecated and renamed toAngle.to_string
. - To be consistent with
astropy.units
, all plural forms of unit names have been removed. Therefore, the following properties ofastropy.coordinates.Angle
should be renamed: radians
->radian
degrees
->degree
hours
->hour
- Multiplication and division of two
Angle
objects used to raiseNotImplementedError
. Now they raiseTypeError
. - The
astropy.coordinates.Angle
class no longer has abounds
attribute so there is no bounds-checking or auto-wrapping at this level. This allowsAngle
objects to be used in arbitrary arithmetic expressions (e.g. coordinate distance computation). - The
astropy.coordinates.RA
andastropy.coordinates.Dec
classes have been removed and replaced withastropy.coordinates.Longitude
andastropy.coordinates.Latitude
respectively. These are now used for the components of Galactic and Horizontal (Alt-Az) coordinates as well instead of plainAngle
objects. astropy.coordinates.angles.rotation_matrix
andastropy.coordinates.angles.angle_axis
now take aunit
kwarg instead ofdegrees
kwarg to specify the units of the angles.rotation_matrix
will also take the unit from the givenAngle
object if no unit is provided.- The
AngularSeparation
class has been removed. The output of the coordinatesseparation()
method is now anastropy.coordinates.Angle
. [#1007] - The coordinate classes have been renamed in a way that remove the
Coordinates
at the end of the class names. E.g.,ICRSCoordinates
from previous versions is now calledICRS
. [#1614] HorizontalCoordinates
are now namedAltAz
, to reflect more common terminology.
astropy.cosmology¶
- The Planck (2013) cosmology will likely give slightly different (and more accurate) results due to the inclusion of Neutrino masses. [#1364]
- Cosmology class properties now return
Quantity
objects instead of simple floating-point values. [#1237] - The names of cosmology instances are now truly optional, and are set to
None
rather than the name of the class if the user does not provide them. [#1705]
astropy.io.ascii¶
- In the
read
method ofastropy.io.ascii
, empty column values in an ASCII table are now treated as missing values instead of the previous treatment as a zero-length string “”. This now corresponds to the behavior of other table readers likenumpy.genfromtxt
. To restore the previous behavior setfill_values=None
in the call toascii.read()
. [#919] - The
read
andwrite
methods ofastropy.io.ascii
now have aformat
argument for specifying the file format. This is the preferred way to choose the format instead of theReader
andWriter
arguments. [#961] - The
include_names
andexclude_names
arguments were removed from theBaseHeader
initializer, and now instead handled by the reader and writer classes directly. [#1350] - Allow numeric and otherwise unusual column names when reading a table
where the
format
argument is specified, but other format details such as the delimiter or quote character are being guessed. [#1692] - When reading an ASCII table using the
Table.read()
method, the default has changed fromguess=False
toguess=True
to allow auto-detection of file format. This matches the default behavior ofascii.read()
.
astropy.io.fits¶
- The
astropy.io.fits.new_table
function is marked “pending deprecation”. This does not mean it will be removed outright or that its functionality has changed. It will likely be replaced in the future for a function with similar, if not subtly different functionality. A better, if not slightly more verbose approach is to usepyfits.FITS_rec.from_columns
to create a newFITS_rec
table–this has the same interface aspyfits.new_table
. The difference is that it returns a planFITS_rec
array, and not an HDU instance. ThisFITS_rec
object can then be used as the data argument in the constructors forBinTableHDU
(for binary tables) orTableHDU
(for ASCII tables). This is analogous to creating anImageHDU
by passing in an image array.pyfits.FITS_rec.from_columns
is just a simpler way of creating a FITS-compatible recarray from a FITS column specification. - The
updateHeader
,updateHeaderData
, andupdateCompressedData
methods of theCompDataHDU
class are pending deprecation and moved to internal methods. The operation of these methods depended too much on internal state to be used safely by users; instead they are invoked automatically in the appropriate places when reading/writing compressed image HDUs. - The
CompDataHDU.compData
attribute is pending deprecation in favor of the clearer and more PEP-8 compatibleCompDataHDU.compressed_data
. - The constructor for
CompDataHDU
has been changed to accept new keyword arguments. The new keyword arguments are essentially the same, but are in underscore_separated format rather than camelCase format. The old arguments are still pending deprecation. - The internal attributes of HDU classes
_hdrLoc
,_datLoc
, and_datSpan
have been replaced with_header_offset
,_data_offset
, and_data_size
respectively. The old attribute names are still pending deprecation. This should only be of interest to advanced users who have created their own HDU subclasses. - The following previously deprecated functions and methods have been removed
entirely:
createCard
,createCardFromString
,upperKey
,ColDefs.data
,setExtensionNameCaseSensitive
,_File.getfile
,_TableBaseHDU.get_coldefs
,Header.has_key
,Header.ascardlist
. - Interfaces that were pending deprecation are now fully deprecated. These
include:
create_card
,create_card_from_string
,upper_key
,Header.get_history
, andHeader.get_comment
. - The
.name
attribute on HDUs is now directly tied to the HDU’s header, so that if.header['EXTNAME']
changes so does.name
and vice-versa.
astropy.io.registry¶
astropy.io.votable¶
- Added a new option
use_names_over_ids
option to use when converting from VOTable objects to Astropy Tables. This can prevent a situation where column names are not preserved when converting from a VOTable. [#609]
astropy.nddata¶
- The
astropy.nddata.convolution
sub-package has now been moved toastropy.convolution
, and themake_kernel
function has been removed. (the kernel classes should be used instead) [#1451]
astropy.stats.funcs¶
- For
sigma_clip
, themaout
optional parameter has been removed, and the function now always returns a masked array. A new boolean parametercopy
can be used to indicated whether the input data should be copied (copy=True
, default) or used by reference (copy=False
) in the output masked array. [#1083]
astropy.table¶
- The first argument to the
Column
andMaskedColumn
classes is now the data array–thename
argument has been changed to an optional keyword argument. [#840] - Added support for instantiating a
Table
from a list of dict, each one representing a single row with the keys mapping to column names. [#901] - The plural ‘units’ and ‘dtypes’ have been switched to ‘unit’ and ‘dtype’ where appropriate. The original attributes are still present in this version as deprecated attributes, but will be removed in the next version. [#1174]
- The
copy
methods ofColumn
andMaskedColumn
were changed so that the first argument is noworder='C'
. This is required for compatibility with Numpy 1.8 which is currently in development. [#1250] - Comparing a column (with == or !=) to a scalar, an array, or another column now always returns a boolean Numpy array (which is a masked array if either of the arguments in the comparison was masked). This is in contrast to the previous behavior, which in some cases returned a boolean Numpy array, and in some cases returned a boolean Column object. [#1446]
astropy.time¶
- For consistency with
Quantity
, the attributesval
andis_scalar
have been renamed tovalue
andisscalar
, respectively, and the attributevals
has been dropped. [#767] - The double-float64 internal representation of time is used more efficiently to enable better accuracy. [#366]
- Format and scale arguments are now allowed to be case-insensitive. [#1128]
astropy.units¶
- The
Quantity
class now inherits from the Numpy array class, and includes the following API changes [#929]: - Using
float(...)
,int(...)
, andlong(...)
on a quantity will now only work if the quantity is dimensionless and unscaled. - All Numpy ufuncs should now treat units correctly (or raise an exception if not supported), rather than extract the value of quantities and operate on this, emitting a warning about the implicit loss of units.
- When using relevant Numpy ufuncs on dimensionless quantities (e.g.
np.exp(h * nu / (k_B * T))
), or combining dimensionless quantities with Python scalars or plain Numpy arrays1 + v / c
, the dimensionless Quantity will automatically be converted to an unscaled dimensionless Quantity. - When initializing a quantity from a value with no unit, it is now set to be dimensionless and unscaled by default. When initializing a Quantity from another Quantity and with no unit specified in the initializer, the unit is now taken from the unit of the Quantity being initialized from.
- Strings are no longer allowed as the values for Quantities. [#1005]
- Quantities are always comparable with zero regardless of their units. [#1254]
- The exception
astropy.units.UnitsException
has been renamed toastropy.units.UnitsError
to be more consistent with the naming of built-in Python exceptions. [#1406] - Multiplication with and division by a string now always returns a Unit (rather than a Quantity when the string was first) [#1408]
- Imperial units are disabled by default.
Bug Fixes¶
astropy.io.ascii¶
- The
write()
function was ignoring thefill_values
argument. [#910] - Fixed an issue in
DefaultSplitter.join
where the delimiter attribute was ignored when writing the CSV. [#1020] - Fixed writing of IPAC tables containing null values. [#1366]
- When a table with no header row was read without specifying the format and
using the
names
argument, then the first row could be dropped. [#1692]
astropy.io.fits¶
- Binary tables containing compressed images may, optionally, contain other columns unrelated to the tile compression convention. Although this is an uncommon use case, it is permitted by the standard.
- Reworked some of the file I/O routines to allow simpler, more consistent mapping between OS-level file modes (‘rb’, ‘wb’, ‘ab’, etc.) and the more “PyFITS-specific” modes used by PyFITS like “readonly” and “update”. That is, if reading a FITS file from an open file object, it doesn’t matter as much what “mode” it was opened in so long as it has the right capabilities (read/write/etc.) Also works around bugs in the Python io module in 2.6+ with regard to file modes.
- Fixed a long-standing issue where writing binary tables did not correctly write the TFORMn keywords for variable-length array columns (they omitted the max array length parameter of the format). This was thought fixed in an earlier version, but it was only fixed for compressed image HDUs and not for binary tables in general.
astropy.nddata¶
- Fixed crash when trying to multiple or divide
NDData
objects with uncertainties. [#1547]
astropy.table¶
astropy.time¶
Time
scale and format attributes are now shown when callingdir()
on aTime
object. [#1130]
astropy.units¶
Misc¶
- Fixed various modules that hard-coded
sys.stdout
as default arguments to functions at import time, rather than using the runtime value ofsys.stdout
. [#1648] - Minor documentation fixes and enhancements [#922, #1034, #1210, #1217, #1491, #1492, #1498, #1582, #1608, #1621, #1646, #1670, #1756]
- Fixed a crash that could sometimes occur when running the test suite on systems with platform names containing non-ASCII characters. [#1698]
Other Changes and Additions¶
- General
- Astropy now follows the PSF Code of Conduct. [#1216]
- Astropy’s test suite now tests all doctests in inline docstrings. Support for running doctests in the reST documentation is planned to follow in v0.3.1.
- Astropy’s test suite can be run on multiple CPUs in parallel, often
greatly improving runtime, using the
--parallel
option. [#1040] - A warning is now issued when using Astropy with Numpy < 1.5–much of Astropy may still work in this case but it shouldn’t be expected to either. [#1479]
- Added automatic download/build/installation of Numpy during Astropy installation if not already found. [#1483]
- Handling of metadata for the
NDData
andTable
classes has been unified by way of a commonMetaData
descriptor–it allows instantiating an object with metadata of any mapping type, and subsequently prevents replacing the mapping stored in the.meta
attribute (only direct updates to that object are allowed). [#1686]
astropy.coordinates¶
- Angles containing out of bounds minutes or seconds (e.g. 60) can be parsed–the value modulo 60 is used with carry to the hours/minutes, and a warning is issued rather than raising an exception. [#990]
astropy.io.fits¶
- The new compression code also adds support for the ZQUANTIZ and ZDITHER0
keywords added in more recent versions of this FITS Tile Compression spec.
This includes support for lossless compression with GZIP. (#198) By default
no dithering is used, but the
SUBTRACTIVE_DITHER_1
andSUBTRACTIVE_DITHER_2
methods can be enabled by passing the correct constants to thequantize_method
argument to theCompImageHDU
constructor. A seed can be manually specified, or automatically generated using either the system clock or checksum-based methods via thedither_seed
argument. See the documentation forCompImageHDU
for more details. - Images compressed with the Tile Compression standard can now be larger than 4 GB through support of the Q format.
- All HDUs now have a
.ver
.level
attribute that returns the value of the EXTVAL and EXTLEVEL keywords from that HDU’s header, if the exist. This was added for consistency with the.name
attribute which returns the EXTNAME value from the header. - Then
Column
andColDefs
classes have new.dtype
attributes which give the Numpy dtype for the column data in the first case, and the full Numpy compound dtype for each table row in the latter case. - There was an issue where new tables created defaulted the values in all string columns to ‘0.0’. Now string columns are filled with empty strings by default–this seems a less surprising default, but it may cause differences with tables created with older versions of PyFITS or Astropy.
astropy.io.misc¶
- The HDF5 reader can now refer to groups in the path as well as datasets; if given a group, the first dataset in that group is read. [#1159]
astropy.nddata¶
NDData
objects have more helpful, though still rudimentary__str__` and ``__repr__
displays. [#1313]
astropy.units¶
0.2.5 (2013-10-25)¶
Bug Fixes¶
astropy.coordinates¶
astropy.io.ascii¶
astropy.io.fits¶
- Improved round-tripping and preservation of manually assigned column
attributes (
TNULLn
,TSCALn
, etc.) in table HDU headers. (Note: This issue was previously reported as fixed in Astropy v0.2.2 by mistake; it is not fixed until v0.3.) [#996] - Fixed a bug that could cause a segfault when trying to decompress an compressed HDU whose contents are truncated (due to a corrupt file, for example). This still causes a Python traceback but better that than a segfault. [#1332]
- Newly created
CompImageHDU
HDUs use the correct value of theDEFAULT_COMPRESSION_TYPE
module-level constant instead of hard-coding “RICE_1” in the header. - Fixed a corner case where when extra memory is allocated to compress an image, it could lead to unnecessary in-memory copying of the compressed image data and a possible memory leak through Numpy.
- Fixed a bug where assigning from an mmap’d array in one FITS file over the old (also mmap’d) array in another FITS file failed to update the destination file. Corresponds to PyFITS issue 25.
- Some miscellaneous documentation fixes.
astropy.io.votable¶
astropy.nddata.convolution¶
- Prevented in-place modification of the input arrays to
convolve()
. [#1153]
astropy.table¶
- Added HTML escaping for string values in tables when outputting the table as HTML. [#1347]
- Added a workaround in a bug in Numpy that could cause a crash when
accessing a table row in a masked table containing
dtype=object
columns. [#1229] - Fixed an issue similar to the one in #1229, but specific to unmasked tables. [#1403]
astropy.units¶
- Improved error handling for unparseable units and fixed parsing CDS units without mantissas in the exponent. [#1288]
- Added a physical type for spectral flux density. [#1410]
- Normalized conversions that should result in a scale of exactly 1.0 to round off slight floating point imprecisions. [#1407]
- Added support in the CDS unit parser/formatter for unusual unit prefixes that are nonetheless required to be supported by that convention. [#1426]
- Fixed the parsing of
sqrt()
in unit format strings which was returningunit ** 2
instead ofunit ** 0.5
. [#1458]
astropy.wcs¶
- When passing a single array to the wcs transformation functions,
(
astropy.wcs.Wcs.all_pix2world
, etc.), its second dimension must now exactly match the number of dimensions in the transformation. [#1395] - Improved error message when incorrect arguments are passed to
WCS.wcs_world2pix
. [#1394] - Fixed a crash when trying to read WCS from FITS headers on Python 3.3 in Windows. [#1363]
- Only headers that are required as part of the WCSLIB C API are installed by the package, per request of system packagers. [#1666]
Misc¶
- Fixed crash when the
COLUMNS
environment variable is set to a non-integer value. [#1291] - Fixed a bug in
ProgressBar.map
wheremultiprocess=True
could cause it to hang on waiting for the process pool to be destroyed. [#1381] - Fixed a crash on Python 3.2 when affiliated packages try to use the
astropy.utils.data.get_pkg_data_*
functions. [#1256] - Fixed a minor path normalization issue that could occur on Windows in
astropy.utils.data.get_pkg_data_filename
. [#1444] - Fixed an annoyance where configuration items intended only for testing showed up in users’ astropy.cfg files. [#1477]
- Prevented crashes in exception logging in unusual cases where no traceback is associated with the exception. [#1518]
- Fixed a crash when running the tests in unusual environments where
sys.stdout.encoding
isNone
. [#1530] - Miscellaneous documentation fixes and improvements [#1308, #1317, #1377, #1393, #1362, #1516]
Other Changes and Additions¶
- Astropy installation now requests setuptools >= 0.7 during build/installation
if neither distribute or setuptools >= 0.7 is already installed. In other
words, if
import setuptools
fails,ez_setup.py
is used to bootstrap the latest setuptools (rather than usingdistribute_setup.py
to bootstrap the now obsolete distribute package). [#1197] - When importing Astropy from a source checkout without having built the
extension modules first an
ImportError
is raised rather than aSystemExit
exception. [#1269]
0.2.4 (2013-07-24)¶
Bug Fixes¶
astropy.cosmology¶
- Fixed a crash in the
comoving_volume
method on non-flat cosmologies when passing it an array of redshifts.
astropy.io.ascii¶
- Fixed a bug that prevented saving changes to the comment symbol when writing changes to a table. [#1167]
astropy.io.fits¶
- Added a workaround for a bug in 64-bit OSX that could cause truncation when writing files greater than 2^32 bytes in size. [#839]
astropy.io.votable¶
- Fixed incorrect reading of tables containing multiple
<RESOURCE>
elements. [#1223]
astropy.table¶
astropy.units¶
Misc¶
- Fixed an installation crash that could occur sometimes on Debian/Ubuntu
and other *NIX systems where
pkg_resources
can be installed without installingsetuptools
. [#1150] - Updated the
distribute_setup.py
bootstrapper to use setuptools >= 0.7 when installing on systems that don’t already have an up to date version of distribute/setuptools. [#1180] - Changed the
version.py
template so that Astropy affiliated packages can (and they should) use their owncython_version.py
andutils._compiler
modules where appropriate. This issue only pertains to affiliated package maintainers. [#1198] - Fixed a corner case where the default config file generation could crash if building with matplotlib but not Sphinx installed in a virtualenv. [#1225]
- Fixed a crash that could occur in the logging module on systems that don’t have a default preferred encoding (in particular this happened in some versions of PyCharm). [#1244]
- The Astropy log now supports passing non-string objects (and calling
str()
on them by default) to the logging methods, in line with Python’s standard logging API. [#1267] - Minor documentation fixes [#582, #696, #1154, #1194, #1212, #1213, #1246, #1252]
0.2.2 (2013-05-21)¶
Bug Fixes¶
astropy.io¶
- Fixed issues in both the
fits
andvotable
sub-packages where array byte order was not being handled consistently, leading to possible crashes especially on big-endian systems. [#1003]
astropy.io.fits¶
- When an error occurs opening a file in fitsdiff the exception message will now at least mention which file had the error.
- Fixed a couple cases where creating a new table using TDIMn in some of the columns could cause a crash.
- Slightly refactored how tables containing variable-length array columns are
handled to add two improvements: Fixes an issue where accessing the data
after a call to the
astropy.io.fits.getdata
convenience function caused an exception, and allows the VLA data to be read from an existing mmap of the FITS file. - Fixed a bug on Python 3 where attempting to open a non-existent file on Python 3 caused a seemingly unrelated traceback.
- Fixed an issue in the tests that caused some tests to fail if Astropy is installed with read-only permissions.
- Fixed a bug where instantiating a
BinTableHDU
from a numpy array containing boolean fields converted all the values toFalse
. - Fixed an issue where passing an array of integers into the constructor of
Column()
when the column type is floats of the same byte width caused the column array to become garbled. - Fixed inconsistent behavior in creating CONTINUE cards from byte strings versus unicode strings in Python 2–CONTINUE cards can now be created properly from unicode strings (so long as they are convertable to ASCII).
- Fixed a bug in parsing HIERARCH keywords that do not have a space after the first equals sign (before the value).
- Prevented extra leading whitespace on HIERARCH keywords from being treated as part of the keyword.
- Fixed a bug where HIERARCH keywords containing lower-case letters was
mistakenly marked as invalid during header validation along with an
ancillary issue where the
Header.index()
method id not work correctly with HIERARCH keywords containing lower-case letters. - Disallowed assigning NaN and Inf floating point values as header values, since the FITS standard does not define a way to represent them in. Because this is undefined, the previous behavior did not make sense and produced invalid FITS files. [#954]
- Fixed an obscure issue that can occur on systems that don’t have flush to memory-mapped files implemented (namely GNU Hurd). [#968]
astropy.io.votable¶
astropy.nddata.convolution¶
- Fixed an issue in
make_kernel()
when using an Airy function kernel. Also removed the superfluous ‘brickwall’ option. [#939]
astropy.table¶
astropy.time¶
- Added appropriate
__copy__
and__deepcopy__
behavior; this omission caused a seemingly unrelated error in FK5 coordinate separation. [#891]
astropy.units¶
- Fixed an issue where the
isiterable()
utility returnedTrue
for quantities with scalar values. Added an__iter__
method for theQuantity
class and fixedisiterable()
to catch false positives. [#878] - Fixed previously undefined behavior when multiplying a unit by a string. [#949]
- Added ‘time’ as a physical type–this was a simple omission. [#959]
- Fixed issues with pickling unit objects so as to play nicer with the multiprocessing module. [#974]
- Made it more difficult to accidentally override existing units with a new unit of the same name. [#1070]
- Added several more physical types and units that were previously omitted, including ‘mass density’, ‘specific volume’, ‘molar volume’, ‘momentum’, ‘angular momentum’, ‘angular speed’, ‘angular acceleration’, ‘electric current’, ‘electric current density’, ‘electric field strength’, ‘electric flux density’, ‘electric charge density’, ‘permittivity’, ‘electromagnetic field strength’, ‘radiant intensity’, ‘data quantity’, ‘bandwidth’; and ‘knots’, ‘nautical miles’, ‘becquerels’, and ‘curies’ respectively. [#1072]
Misc¶
- Fixed a permission error that could occur when running
astropy.test()
on Python 3 when Astropy is installed as root. [#811] - Made it easier to filter warnings from the
convolve()
function and fromQuantity
objects. [#853] - Fixed a crash that could occur in Python 3 when generation of the default config file fails during setup. [#952]
- Fixed an unrelated error message that could occur when trying to import astropy from a source checkout without having build the extension modules first. This issue was claimed to be fixed in v0.2.1, but the fix itself had a bug. [#971]
- Fixed a crash that could occur when running the
build_sphinx
setup command in Python 3. [#977] - Added a more helpful error message when trying to run the
setup.py build_sphinx
command when Sphinx is not installed. [#1027] - Minor documentation fixes and restructuring. [#935, #967, #978, #1004, #1028, #1047]
0.2.1 (2013-04-03)¶
Bug Fixes¶
astropy.coordinates¶
astropy.io.fits¶
- Properly supports the ZQUANTIZ keyword used to support quantization level–this includes working support for lossless GZIP compression of images.
- Fixed support for opening gzipped FITS files in a writeable mode. [#256]
- Added a more helpful exception message when trying to read invalid values
from a table when the required
TNULLn
keyword is missing. [#309] - More refactoring of the tile compression handling to work around a potential memory access violation that was particularly prevalent on Windows. [#507]
- Fixed an integer size mismatch in the compression module that could affect 32-bit systems. [#786]
- Fixed malformatting of the
TFORMn
keywords when writing compressed image tables (they omitted the max array length parameter from the variable-length array format). - Fixed a crash that could occur when writing a table containing multi- dimensional array columns from an existing file into a new file.
- Fixed a bug in fitsdiff that reported two header keywords containing NaN as having different values.
astropy.io.votable¶
- Fixed links to the
astropy.io.votable
documentation in the VOTable validator output. [#806] - When reading VOTables containing integers that are out of range for their column type, display a warning rather than raising an exception. [#825]
- Changed the default string format for floating point values for better round-tripping. [#856]
- Fixed opening VOTables through the
Table.read()
interface for tables that have no names. [#927] - Fixed creation of VOTables from an Astropy table that does not have a data mask. [#928]
- Minor documentation fixes. [#932]
astropy.nddata.convolution¶
- Added better handling of
inf
values to theconvolve_fft
family of functions. [#893]
astropy.table¶
- Fixed silent failure to assign values to a row on multiple columns. [#764]
- Fixed various buggy behavior when viewing a table after sorting by one of its columns. [#829]
- Fixed using
numpy.where()
with table indexing. [#838] - Fixed a bug where opening a remote table with
Table.read()
could cause the entire table to be downloaded twice. [#845] - Fixed a bug where
MaskedColumn
no longer worked if the column being masked is renamed. [#916]
astropy.units¶
astropy.wcs¶
Misc¶
- Fixed a minor issue when installing with
./setup.py develop
on a fresh git clone. This is likely only of interest to developers on Astropy. [#725] - Fixes a crash with
ImportError: No module named 'astropy.version'
when running setup.py from a source checkout for the first time on OSX with Python 3.3. [#820] - Fixed an installation issue where running
./setup.py install
or when installing with pip the.astropy
directory gets created in the home directory of the user running the command. The user’s.astropy
directory should only be created when they use Astropy, not when they install it. [#867] - Fixed an exception when creating a
ProgressBar
with a “total” of 0. [#752] - Added better documentation of behavior that can occur when trying to import the astropy package from within a source checkout without first building the extension modules. [#795, #864]
- Added link to the installation instructions in the README. [#797]
- Catches segfaults in xmllint which can occur sometimes and is otherwise out of our control. [#803]
- Minor changes to the documentation template. [#805]
- Fixed a minor exception handling bug in
download_file()
. [#808] - Added cleanup of any temporary files if an error occurs in
download_file()
. [#857] - Filesystem free space is checked for before attempting to download a file
with
download_file()
. [#858] - Fixed package data locating to work across symlinks–required to work with some OS packaging layouts. [#827]
- Fixed a bug when building Cython extensions where hidden files containing
.pyx
extensions could cause the build to crash. This can be an issue with software and filesystems that autogenerate hidden files. [#834] - Fixed bug that could cause a “script” called README.rst to be installed in a bin directory. [#852]
- Fixed some miscellaneous and mostly rare reference leaks caught by cpychecker. [#914]
Other Changes and Additions¶
- Added logo and branding for Windows binary installers. [#741]
- Upgraded included version libexpat to 2.1.0. [#781]
- ~25% performance improvement in unit composition/decomposition. [#836]
- Added previously missing LaTeX formatting for
L_sun
andR_sun
. [#841] - ConfigurationItems now have a more useful and informative __repr__ and improved documentation for how to use them. [#855]
- Added a friendlier error message when trying to import astropy from a source checkout without first building the extension modules inplace. [#864]
- py.test now outputs more system information for help in debugging issues from users. [#869]
- Added unit definitions “mas” and “uas” for “milliarcsecond” and “microarcsecond” respectively. [#892]
0.2 (2013-02-19)¶
New Features¶
astropy.coordinates¶
- This new subpackage contains a representation of celestial coordinates, and provides a wide range of related functionality. While fully-functional, it is a work in progress and parts of the API may change in subsequent releases.
astropy.cosmology¶
Update to include cosmologies with variable dark energy equations of state. (This introduces some API incompatibilities with the older Cosmology objects).
Added parameters for relativistic species (photons, neutrinos) to the astropy.cosmology classes. The current treatment assumes that neutrinos are massless. [#365]
Add a WMAP9 object using the final (9-year) WMAP parameters from Hinshaw et al. 2013. It has also been made the default cosmology. [#629, #724]
astropy.table I/O infrastructure for custom readers/writers implemented. [#305]
Added support for reading/writing HDF5 files [#461]
Added support for masked tables with missing or invalid data [#451]
New
astropy.time
sub-package. [#332]New
astropy.units
sub-package that includes a class for units (astropy.units.Unit
) and scalar quantities that have units (astropy.units.Quantity
). [#370, #445]This has the following effects on other sub-packages:
In
astropy.wcs
, thewcs.cunit
list now takes and returnsastropy.units.Unit
objects. [#379]In
astropy.nddata
, units are now stored asastropy.units.Unit
objects. [#382]In
astropy.table
, units on columns are now stored asastropy.units.Unit
objects. [#380]In
astropy.constants
, constants are now stored asastropy.units.Quantity
objects. [#529]
astropy.io.ascii¶
- Improved integration with the
astropy.table
Table class so that table and column metadata (e.g. keywords, units, description, formatting) are directly available in the output table object. The CDS, DAOphot, and IPAC format readers now provide this type of integrated metadata. - Changed to using
astropy.table
masked tables instead of NumPy masked arrays for tables with missing values. - Added SExtractor table reader to
astropy.io.ascii
[#420] - Removed the Memory reader class which was used to convert data input
passed to the
write
function into an internal table. Insteadwrite
instantiates an astropy Table object using the data input towrite
. - Removed the NumpyOutputter as the output of reading a table is now
always a
Table
object. - Removed the option of supplying a function as a column output formatter.
- Added a new
strip_whitespace
keyword argument to thewrite
function. This controls whether whitespace is stripped from the left and right sides of table elements before writing. Default is True. - Fixed a bug in reading IPAC tables with null values.
- Generalized I/O infrastructure so that
astropy.nddata
can also have custom readers/writers [#659]
astropy.wcs¶
- From updating the underlying wcslib 4.16:
- When
astropy.wcs.WCS
constructs a default coordinate representation it will give it the special name “DEFAULTS”, and will not report “Found one coordinate representation”.
Other Changes and Additions¶
- A configuration file with all options set to their defaults is now generated
when astropy is installed. This file will be pulled in as the users’
astropy configuration file the first time they
import astropy
. [#498] - Astropy doc themes moved into
astropy.sphinx
to allow affiliated packages to access them. - Added expanded documentation for the
astropy.cosmology
sub-package. [#272] - Added option to disable building of “legacy” packages (pyfits, vo, etc.).
- The value of the astronomical unit (au) has been updated to that adopted by IAU 2012 Resolution B2, and the values of the pc and kpc constants have been updated to reflect this. [#368]
- Added links to the documentation pages to directly edit the documentation on GitHub. [#347]
- Several updates merged from
pywcs
intoastropy.wcs
[#384]: - Improved the reading of distortion images.
- Added a new option to choose whether or not to write SIP coefficients.
- Uses the
relax
option by default so that non-standard keywords are allowed. [#585] - Added HTML representation of tables in IPython notebook [#409]
- Rewrote CFITSIO-based backend for handling tile compression of FITS files. It now uses a standard CFITSIO instead of heavily modified pieces of CFITSIO as before. Astropy ships with its own copy of CFITSIO v3.30, but system packagers may choose instead to strip this out in favor of a system-installed version of CFITSIO. This corresponds to PyFITS ticket 169. [#318]
- Moved
astropy.config.data
toastropy.utils.data
and re-factored the I/O routines to separate out the generic I/O code that can be used to open any file or resource from the code used to access Astropy-related data. The ‘core’ I/O routine is nowget_readable_fileobj
, which can be used to access any local as well as remote data, supports caching, and can decompress gzip and bzip2 files on-the-fly. [#425] - Added a classmethod to
astropy.coordinates.coordsystems.SphericalCoordinatesBase
that performs a name resolve query using Sesame to retrieve coordinates for the requested object. This works for any subclass ofSphericalCoordinatesBase
, but requires an internet connection. [#556] - astropy.nddata.convolution removed requirement of PyFFTW3; uses Numpy’s FFT by default instead with the added ability to specify an FFT implementation to use. [#660]
Bug Fixes¶
astropy.io.ascii¶
astropy.io.fits¶
- Improved handling of scaled images and pseudo-unsigned integer images in
compressed image HDUs. They now work more transparently like normal image
HDUs with support for the
do_not_scale_image_data
anduint
options, as well asscale_back
andsave_backup
. The.scale()
method works better too. Corresponds to PyFITS ticket 88. - Permits non-string values for the EXTNAME keyword when reading in a file, rather than throwing an exception due to the malformatting. Added verification for the format of the EXTNAME keyword when writing. Corresponds to PyFITS ticket 96.
- Added support for EXTNAME and EXTVER in PRIMARY HDUs. That is, if EXTNAME
is specified in the header, it will also be reflected in the
.name
attribute and infits.info()
. These keywords used to be verboten in PRIMARY HDUs, but the latest version of the FITS standard allows them. Corresponds to PyFITS ticket 151. - HCOMPRESS can again be used to compress data cubes (and higher-dimensional arrays) so long as the tile size is effectively 2-dimensional. In fact, compatible tile sizes will automatically be used even if they’re not explicitly specified. Corresponds to PyFITS ticket 171.
- Fixed a bug that could cause a deadlock in the filesystem on OSX when reading the data from certain types of FITS files. This only occurred when used in conjunction with Numpy 1.7. [#369]
- Added support for the optional
endcard
parameter in theHeader.fromtextfile()
andHeader.totextfile()
methods. Althoughendcard=False
was a reasonable default assumption, there are still text dumps of FITS headers that include the END card, so this should have been more flexible. Corresponds to PyFITS ticket 176. - Fixed a crash when running fitsdiff on two empty (that is, zero row) tables. Corresponds to PyFITS ticket 178.
- Fixed an issue where opening a FITS file containing a random group HDU in update mode could result in an unnecessary rewriting of the file even if no changes were made. This corresponds to PyFITS ticket 179.
- Fixed a crash when generating diff reports from diffs using the
ignore_comments
options. Corresponds to PyFITS ticket 181. - Fixed some bugs with WCS distortion paper record-valued keyword cards:
- Cards that looked kind of like RVKCs but were not intended to be were over-permissively treated as such–commentary keywords like COMMENT and HISTORY were particularly affected. Corresponds to PyFITS ticket 183.
- Looking up a card in a header by its standard FITS keyword only should always return the raw value of that card. That way cards containing values that happen to valid RVKCs but were not intended to be will still be treated like normal cards. Corresponds to PyFITS ticket 184.
- Looking up a RVKC in a header with only part of the field-specifier (for example “DP1.AXIS” instead of “DP1.AXIS.1”) was implicitly treated as a wildcard lookup. Corresponds to PyFITS ticket 184.
- Fixed a crash when diffing two FITS files where at least one contains a compressed image HDU which was not recognized as an image instead of a table. Corresponds to PyFITS ticket 187.
- Fixed a bug where opening a file containing compressed image HDUs in ‘update’ mode and then immediately closing it without making any changes caused the file to be rewritten unnecessarily.
- Fixed two memory leaks that could occur when writing compressed image data, or in some cases when opening files containing compressed image HDUs in ‘update’ mode.
- Fixed a bug where
ImageHDU.scale(option='old')
wasn’t working at all–it was not restoring the image to its original BSCALE and BZERO values. - Fixed a bug when writing out files containing zero-width table columns, where the TFIELDS keyword would be updated incorrectly, leaving the table largely unreadable.
- Fixed a minor string formatting issue.
- Fixed bugs in the backwards compatibility layer for the
CardList.index
andCardList.count
methods. Corresponds to PyFITS ticket 190. - Improved
__repr__
and text file representation of cards with long values that are split into CONTINUE cards. Corresponds to PyFITS ticket 193. - Fixed a crash when trying to assign a long (> 72 character) value to blank (‘’) keywords. This also changed how blank keywords are represented–there are still exactly 8 spaces before any commentary content can begin; this may affect the exact display of header cards that assumed there could be fewer spaces in a blank keyword card before the content begins. However, the current approach is more in line with the requirements of the FITS standard. Corresponds to PyFITS ticket 194.
astropy.io.votable¶
- The
Table
class now maintains a single array object which is a Numpy masked array. For variable-length columns, the object that is stored there is also a Numpy masked array. - Changed the
pedantic
configuration option to beFalse
by default due to the vast proliferation of non-compliant VO Tables. [#296] - Renamed
astropy.io.vo
toastropy.io.votable
.
astropy.table¶
- Added a workaround for an upstream bug in Numpy 1.6.2 that could cause a maximum recursion depth RuntimeError when printing table rows. [#341]
astropy.wcs¶
- Updated to wcslib 4.15 [#418]
- Fixed a problem with handling FITS headers on locales that do not use dot as a decimal separator. This required an upstream fix to wcslib which is included in wcslib 4.14. [#313]
- Fixed some tests that could fail due to missing/incorrect logging configuration–ensures that tests don’t have any impact on the default log location or contents. [#291]
- Various minor documentation fixes [#293 and others]
- Fixed a bug where running the tests with the
py.test
command still tried to replace the system-installed pytest with the one bundled with Astropy. [#454] - Improved multiprocessing compatibility for file downloads. [#615]
- Fixed handling of Cython modules when building from a source checkout of a tagged release version. [#594]
- Added a workaround for a bug in Sphinx that could occur when using the
:tocdepth:
directive. [#595] - Minor VOTable fixes [#596]
- Fixed how
setup.py
usesdistribute_setup.py
to prevent possibleVersionConflict
errors when an older version of distribute is already installed on the user’s system. [#616, #640] - Changed use of
log.warn
in the logging module tolog.warning
since the former is deprecated. [#624]
0.1 (2012-06-19)¶
- Initial release.