astropy changelog

Changelog History

Page 1

• v4.1

  🆕 New Features

  astropy.config ^{^}

  • ➕ Add new function generate_config to generate the configuration file and include it in the documentation. [#10148]

  • ConfigNamespace.__iter__ and ConfigNamespace.keys now yield ConfigItem names defined within it. Similarly, items and values would yield like a Python dictionary would. [#10139]

  astropy.constants

  astropy.convolution

  astropy.coordinates

  • ➕ Added a new SpectralCoord class that can be used to define spectral coordinates and transform them between different velocity frames. [#10185]

  • 📜 Angle parsing now supports cardinal direction in the cases where angles are initialized as string instances. eg "17°53'27"W".[#9859]

  • 👍 Allow in-place modification of array-valued Frame and SkyCoord objects. This provides limited support for updating coordinate data values from another coordinate object of the same class and equivalent frame attributes. [#9857]

  • ➕ Added a robust equality operator for comparing SkyCoord, frame, and representation objects. A comparison like sc1 == sc2 will now return a boolean or boolean array where the objects are strictly equal in all relevant frame attributes and coordinate representation values. [#10154]

  • ➕ Added the True Equator Mean Equinox (TEME) frame. [#10149]

  • ✅ The Galactocentric frame will now use the "latest" parameter definitions by default. This currently corresponds to the values defined in v4.0, but will change with future releases. [#10238]

  • The SkyCoord.from_name() and Sesame name resolving functionality now is able to cache results locally and will do so by default. [#9162]

  • 👍 Allow in-place modification of array-valued Representation and Differential objects, including of representations with attached differentials. [#10210]

  astropy.cosmology

  astropy.extern ^{^}

  astropy.io.ascii ^{^}

  • Functional Units can now be processed in CDS-tables. [#9971]

  • 👍 Allow reading in ASCII tables which have duplicate column names. [#9939]

  • Fixed failure of ASCII fast_reader to handle names, include_names, exclude_names arguments for RDB formatted tables. Homogenised checks and exceptions for invalid names arguments. Improved performance when parsing "wide" tables with many columns. [#10306]

  • ➕ Added type validation of key arguments in calls to io.ascii.read() and io.ascii.write() functions. [#10005]

  astropy.io.misc ^{^}

  • ➕ Added serialization of parameter constraints fixed and bounds. [#10082]

  • Added 'functional_models.py' and 'physical_models.py' to asdf/tags/transform, with to allow serialization of all functional and physical models. [#10028, #10293]

  • 🛠 Fix ASDF serialization of circular model inverses, and remove explicit calls to asdf.yamlutil functions that became unnecessary in asdf 2.6.0. [#10189, #10384]

  astropy.io.fits ^{^}

  • ➕ Added support for writing Dask arrays to disk efficiently for ImageHDU and PrimaryHDU. [#9742]

  • ➕ Add HDU name and ver to FITSDiff report where appropriate [#10197]

  astropy.io.registry

  astropy.io.votable

  • 🆕 New exceptions.conf.max_warnings configuration item to control the number of times a type of warning appears before being suppressed. [#10152]

  astropy.modeling ^{^}

  • ➕ Added Plummer1D model to functional_models. [#9896]

  • ➕ Added UnitsMapping model and Model.coerce_units to support units on otherwise unitless models. [#9936]

  • ➕ Added domain and window attributes to repr and str. Fixed bug with _format_repr in core.py. [#9941]

  • Polynomial attributes domain and window are now tuples of size 2 and are validated. repr and print show only their non-default values. [#10145]

  • ➕ Added replace_submodel() method to CompoundModel to modify an existing instance. [#10176]

  • Delay construction of CompoundModel inverse until property is accessed, to support ASDF deserialization of circular inverses in component models. [#10384]

  astropy.nddata ^{^}

  • ➕ Added support in the bitmask module for using mnemonic bit flag names when specifying the bit flags to be used or ignored when converting a bit field to a boolean. [#10095, #10208]

  • Added reshape_as_blocks function to reshape a data array into blocks, which is useful to efficiently apply functions on block subsets of the data instead of using loops. The reshaped array is a view of the input data array. [#10214]

  • ➕ Added a cache keyword option to allow caching for CCDData.read if filename is a URL. [#10265]

  astropy.samp ^{^}

  astropy.stats ^{^}

  astropy.table ^{^}

  • ➕ Added ability to specify a custom matching function for table joins. In particular this makes it possible to do cross-match table joins on SkyCoord, Quantity, or standard columns, where column entries within a specified distance are considered to be matched. [#10169]

  • ➕ Added units and descriptions keyword arguments to the Table object initialization and Table.read() methods. This allows directly setting the unit and description for the table columns at the time of creating or reading the table. [#9671]

  • 👉 Make table Row work as mappings, by adding .keys() and .values() methods. With this **row becomes possible, as does, more simply, turning a Row into a dictionary with dict(row). [#9712]

  • ➕ Added two new Table methods .items() and .values(), which return respectively tbl.columns.items() (iterator over name, column tuples) and tbl.columns.values() (list of columns) for a Table object tbl. [#9780]

  • ➕ Added new Table method .round(), which rounds numeric columns to the specified number of decimals. [#9862]

  • Updated to_pandas() and from_pandas() to use and support Pandas nullable integer data type for masked integer data. [#9541]

  • The HDF5 writer, write_table_hdf5(), now allows passing through additional keyword arguments to the h5py.Group.create_dataset(). [#9602]

  • ➕ Added capability to add custom table attributes to a Table subclass. These attributes are persistent and can be set during table creation. [#10097]

  • ➕ Added support for SkyCoord mixin columns in dstack, vstack and insert_row functions. [#9857]

  • ➕ Added support for coordinate Representation and Differential mixin columns. [#10210]

  ✅ astropy.tests ^{^}

  astropy.time ^{^}

  • ➕ Added a new time format unix_tai which is essentially Unix time but with leap seconds included. More precisely, this is the number of seconds since 1970-01-01 00:00:08 TAI and corresponds to the CLOCK_TAI clock available on some linux platforms. [#10081]

  astropy.timeseries

  astropy.uncertainty

  astropy.units ^{^}

  • ➕ Added torr pressure unit. [#9787]

  • ➕ Added the equal_nan keyword argument to isclose and allclose, and updated the docstrings. [#9849]

  • ➕ Added Rankine temperature unit. [#9916]

  • ➕ Added integrated flux unit conversion to spectral_density equivalency. [#10015]

  • 🔄 Changed pixel_scale equivalency to allow scales defined in any unit. [#10123]

  • The quantity_input decorator now optionally allows passing through numeric values or numpy arrays with numeric dtypes to arguments where dimensionless_unscaled is an allowed unit. [#10232]

  astropy.utils ^{^}

  • ➕ Added a new MetaAttribute class to support easily adding custom attributes to a subclass of classes like Table or NDData that have a meta attribute. [#10097]

  astropy.visualization

  • ➕ Added invalid keyword to SqrtStretch, LogStretch, PowerStretch, and ImageNormalize classes and the simple_norm function. This keyword is used to replace generated NaN values. [#10182]

  astropy.wcs ^{^}

  • WCS objects with a spectral axis will now return SpectralCoord objects when calling pixel_to_world instead of Quantity, and can now take either Quantity or SpectralCoord as input to pixel_to_world. [#10185]

  • 👍 Implemented support for the -TAB algorithm (WCS Paper III). [#9641]

  • Added an _as_mpl_axes method to the HightLevelWCSWrapper class. [#10138]

  API Changes

  astropy.config ^{^}

  astropy.constants

  astropy.convolution

  astropy.coordinates

  • The equality operator for comparing SkyCoord, frame, and representation objects was changed. A comparison like sc1 == sc2 was previously equivalent to sc1 is sc2. It will now return a boolean or boolean array where the objects are strictly equal in all relevant frame attributes and coordinate representation values. If the objects have different frame attributes or representation types then an exception will be raised. [#10154]

  • SkyCoord.radial_velocity_correction now allows you to pass an obstime directly when the SkyCoord also has an obstime set. In this situation, the position of the SkyCoord has space motion applied to correct to the passed obstime. This allows mm/s radial velocity precision for objects with large space motion. [#10094]

  • For consistency with other astropy classes, coordinate Representations and Differentials can now be initialized with an instance of their own class if that instance is passed in as the first argument. [#10210]

  astropy.cosmology

  astropy.extern ^{^}

  astropy.io.ascii ^{^}

  • 🔄 Changed the behavior when reading a table where both the names argument is provided (to specify the output column names) and the converters argument is provided (to specify column conversion functions). Previously the converters dict names referred to the input table column names, but now they refer to the output table column names. [#9739]

  astropy.io.misc ^{^}

  astropy.io.fits ^{^}

  astropy.io.registry

  astropy.io.votable

  astropy.modeling ^{^}

  astropy.nddata ^{^}

  astropy.samp ^{^}

  astropy.stats ^{^}

  astropy.table ^{^}

  • 👍 Table.from_pandas now supports a units dictionary as argument to pass units for columns in the DataFrame. [#9472]

  ✅ astropy.tests ^{^}

  astropy.time ^{^}

  • Require that in_subfmt and out_subfmt properties of a Time object have allowed values at the time of being set, either when creating the object or when setting those properties on an existing Time instance. Previously the validation of those properties was not strictly enforced. [#9868]

  astropy.timeseries

  astropy.uncertainty

  astropy.units ^{^}

  astropy.utils ^{^}

  • Changed the exception raised by get_readable_fileobj on missing compression modules (for bz2 or lzma/xz support) to ModuleNotFoundError, consistent with io.fits file handlers. [#9761]

  astropy.visualization

  • Deprecated the imshow_only_kwargs keyword in imshow_norm. [#9915]

  • Non-finite input values are now automatically excluded in HistEqStretch and InvertedHistEqStretch. [#10177]

  • The PowerDistStretch and InvertedPowerDistStretch a value is restricted to be a >= 0 in addition to a != 1. [#10177]

  • 🔊 The PowerStretch, LogStretch, and InvertedLogStretch a value is restricted to be a > 0. [#10177]

  • The AsinhStretch and SinhStretch a value is restricted to be 0 < a <= 1. [#10177]

  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

  • For FIELDs with datatype="char", store the values as strings instead of bytes. [#9505]

  astropy.modeling ^{^} astropy.nddata ^{^}

  astropy.samp ^{^}

  astropy.stats ^{^}

  astropy.table ^{^}

  ✅ astropy.tests ^{^}

  astropy.time ^{^}

  astropy.timeseries

  astropy.uncertainty

  astropy.units ^{^}

  astropy.utils ^{^}

  astropy.visualization

  astropy.wcs ^{^}

  • WCS objects with a spectral axis will now return SpectralCoord objects when calling pixel_to_world instead of Quantity (note that SpectralCoord is a sub-class of Quantity). [#10185]

  Other Changes and Additions

  • 🏗 The way in which users can specify whether to build astropy against existing installations of C libraries rather than the bundled one has changed, and should now be done via environment variables rather than setup.py flags (e.g. --use-system-erfa). The available variables are ASTROPY_USE_SYSTEM_CFITSIO, ASTROPY_USE_SYSTEM_ERFA, ASTROPY_USE_SYSTEM_EXPAT, ASTROPY_USE_SYSTEM_WCSLIB, and ASTROPY_USE_SYSTEM_ALL. These should be set to 1 to build against the system libraries. [#9730]

  • ⚡️ The infrastructure of the package has been updated in line with the APE 17 roadmap (https://github.com/astropy/astropy-APEs/blob/master/APE17.rst). The main changes are that the python setup.py test and python setup.py build_docs commands will no longer work. The easiest way to replicate these commands is to install the tox (https://tox.readthedocs.io) package and run tox -e test and tox -e build_docs. It is also possible to run pytest and sphinx directly. Other significant changes include switching to setuptools_scm to manage the version number, and adding a pyproject.toml to opt in to isolated builds as described in PEP 517/518. [#9726]

  • ⚡️ Bundled expat is updated to version 2.2.9. [#10038]

  • Increase minimum asdf version to 2.6.0. [#10189]

  • ⚡️ The bundled version of PLY was updated to 3.11. [#10258]

  • ✂ Removed dependency on scikit-image. [#10214]

• v4.1.dev

  November 29, 2019

• v4.0.2

  🆕 New Features

  astropy.utils ^{^}

  • 👍 astropy.utils.data.download_file now supports FTPS/FTP over TLS. [#9964]

  astropy.wcs ^{^}

  • The new auxiliary WCS parameters added in WCSLIB 7.1 are now exposed as the aux attribute of Wcsprm. [#10333]

  🐛 Bug fixes

  astropy.config ^{^}

  astropy.constants

  astropy.convolution

  astropy.coordinates

  • Ensure that for size-1 array SkyCoord and coordinate frames the attributes also properly become scalars when indexed with 0. [#10113]

  • 🛠 Fixed a bug where SkyCoord.separation() and SkyCoord.separation_3d were not accepting a frame object. [#10332]

  • Ensure that the lon values in SkyOffsetFrame are wrapped correctly at 180 degree regardless of how the underlying data is represented. [#10163]

  • 🛠 Fixed an error in the obliquity of the ecliptic when transforming to/from the *TrueEcliptic coordinate frames. The error would primarily result in an inaccuracy in the ecliptic latitude on the order of arcseconds. [#10129]

  • 🛠 Fixed an error in the computation of the location of solar system bodies where the Earth location of the observer was ignored during the correction for light travel time. [#10292]

  • Ensure that coordinates with proper motion that are transformed to other coordinate frames still can be represented properly. [#10276]

  • 👌 Improve the error message given when trying to get a cartesian representation for coordinates that have both proper motion and radial velocity, but no distance. [#10276]

  • Fixed an error where SkyCoord.apply_space_motion would return incorrect results when no distance is set and proper motion is high. [#10296]

  astropy.cosmology

  astropy.extern ^{^}

  astropy.io.ascii ^{^}

  • 🛠 Fixed a bug with the C fast_reader not correctly parsing newlines when delimiter was also set to \n or \r; ensured consistent handling of input strings without newline characters. [#9929]

  astropy.io.fits ^{^}

  • 🛠 Fix unclosed memory-mapped FITS files in FITSDiff when difference found. [#10159]

  • 🛠 Fix crash when reading an invalid table file. [#10171]

  astropy.io.misc ^{^}

  • 🛠 Fix id URL in baseframe-1.0.0 ASDF schema. [#10223]

  astropy.io.registry

  astropy.io.votable

  • 🛠 Fixed parsing failure of VOTable with no fields. When detecting a non-empty table with no fields, the following warning/exception is issued: E25 "No FIELDs are defined; DATA section will be ignored." [#10192]

  astropy.modeling ^{^}

  • Fixed a problem with mapping input_units and return_units of a CompoundModel to the units of the constituent models. [#10158]

  • ✂ Removed hard-coded names of inputs and outputs. [#10174]

  • 🛠 Fixed a problem where slicing a CompoundModel by name will crash if there fix_inputs operators are present. [#10224]

  astropy.nddata ^{^}

  astropy.samp ^{^}

  astropy.stats ^{^}

  • 🛠 Fixed an issue where fully masked MaskedArray input to sigma_clipped_stats gave incorrect results. [#10099]

  • Fixed an issued where sigma_clip and SigmaClip.__call__ would return a masked array instead of a ndarray when masked=False and the input was a full-masked MaskedArray. [#10099]

  astropy.table ^{^}

  • 🛠 Fixed a bug when writing a table with mixin columns to FITS, ECSV or HDF5. If one of the data attributes of the mixin (e.g. skycoord.ra) had the same name as one of the table column names (ra), the column (ra) would be dropped when reading the table back. [#10222]

  • 🛠 Fixed a bug when sorting an indexed table on the indexed column after first sorting on another column. [#10103]

  • 🛠 Fixed a bug in table argsort when called with reverse=True for an indexed table. [#10103]

  ✅ astropy.tests ^{^}

  astropy.time ^{^}

  • Ensure that for size-1 array Time, the location also properly becomes a scalar when indexed with 0. [#10113]

  astropy.timeseries

  astropy.uncertainty

  astropy.units ^{^}

  astropy.utils ^{^}

  • ⚡️ The default IERS server has been updated to use the FTPS server hosted by CDDIS. [#9964]

  • 🛠 Fixed memory allocation on 64-bit systems within xml.iterparse [#10076]

  • 🛠 Fix case where None could be used in a numerical computation. [#10126]

  astropy.visualization

  • 🛠 Fixed a bug where the ImageNormalize clip keyword was ignored when used with calling the object on data. [#10098]

  astropy.wcs ^{^}

  • Handled WCS 360 -> 0 deg crossover in fit_wcs_from_points [#10155]

  Other Changes and Additions

  • 👌 Improved the speed of sorting a large Table on a single column by a factor of around 5. [#10103]

  • Ensure that astropy can be used inside Application bundles built with pyinstaller. [#8795]

  • ⚡️ Updated the bundled CFITSIO library to 3.480. See cextern/cfitsio/docs/changes.txt for additional information. [#10256]

• v4.0.1

  March 27, 2020

  🐛 Bug fixes

  astropy.config ^{^}

  • 🛠 Fixed a bug where importing a development version of a package that uses astropy configuration system can result in a ~/.astropy/config/package..cfg file. [#9975]

  astropy.coordinates

  • 🛠 Fixed a bug where a vestigal trace of a frame class could persist in the transformation graph even after the removal of all transformations involving that frame class. [#9815]

  • 🛠 Fixed a bug with TransformGraph.remove_transform() when the "from" and "to" frame classes are not explicitly specified. [#9815]

  • Read-only longitudes can now be passed in to EarthLocation even if they include angles outside of the range of -180 to 180 degrees. [#9900]

  • SkyCoord.radial_velocity_correction no longer raises an Exception when space motion information is present on the SkyCoord. [#9980]

  astropy.io ^{^}

  • 🛠 Fixed a bug that prevented the unified I/O infrastructure from working with datasets that are represented by directories rather than files. [#9866]

  astropy.io.ascii ^{^}

  • 🛠 Fixed a bug in the fast_reader C parsers incorrectly returning entries of isolated positive/negative signs as float instead of str. [#9918]

  • 🛠 Fixed a segmentation fault in the fast_reader C parsers when parsing an invalid file with guess=True and the file contains inconsistent column numbers in combination with a quoted field; e.g., "1 2\n 3 4 '5'". [#9923]

  • Magnitude, decibel, and dex can now be stored in ecsv files. [#9933]

  astropy.io.misc ^{^}

  • Magnitude, decibel, and dex can now be stored in hdf5 files. [#9933]

  • 🛠 Fixed serialization of polynomial models to include non default values of domain and window values. [#9956, #9961]

  • 🛠 Fixed a bug which affected overwriting tables within hdf5 files. Overwriting an existing path with associated column meta data now also overwrites the meta data associated with the table. [#9950]

  • 🛠 Fixed serialization of Time objects with location under time-1.0.0 ASDF schema. [#9983]

  astropy.io.fits ^{^}

  • 🛠 Fix regression with GroupsHDU which needs to modify the header to handle invalid headers, and fix accesing .data for empty HDU. [#9711, #9934]

  • 🛠 Fix fitsdiff when its arguments are directories that contain other directories. [#9711]

  • 🛠 Fix writing noncontiguous data to a compressed HDU. [#9958]

  • ➕ Added verification of disp (TDISP) keyword to fits.Column and extended tests for TFORM and TDISP validation. [#9978]

  • 🛠 Fix checksum verification to process all HDUs instead of only the first one because of the lazy loading feature. [#10012]

  • 👍 Allow passing output_verify to .close when using the context manager. [#10030]

  • Prevent instantiation of PrimaryHDU and ImageHDU with a scalar. [#10041]

  • 🛠 Fix column access by attribute with FITS_rec: columns with scaling or columns from ASCII tables where not properly converted when accessed by attribute name. [#10069]

  astropy.io.misc ^{^}

  • Magnitude, decibel, and dex can now be stored in hdf5 files. [#9933]

  • 🛠 Fixed serialization of polynomial models to include non default values of domain and window values. [#9956, #9961]

  • 🛠 Fixed a bug which affected overwriting tables within hdf5 files. Overwriting an existing path with associated column meta data now also overwrites the meta data associated with the table. [#9950]

  • 🛠 Fixed serialization of Time objects with location under time-1.0.0 ASDF schema. [#9983]

  astropy.modeling ^{^}

  • 🛠 Fixed a bug in setting default values of parameters of orthonormal polynomials when constructing a model set. [#9987]

  astropy.table ^{^}

  • 🛠 Fixed bug in Table.reverse for tables that contain non-mutable mixin columns (like SkyCoord) for which in-place item update is not allowed. [#9839]

  • Tables containing Magnitude, decibel, and dex columns can now be saved to ecsv files. [#9933]

  • 🛠 Fixed bug where adding or inserting a row fails on a table with an index defined on a column that is not the first one. [#10027]

  • Ensured that table.show_in_browser also worked for mixin columns like Time and SkyCoord. [#10068]

  astropy.time ^{^}

  • 🛠 Fix inaccuracy when converting between TimeDelta and datetime.timedelta. [#9679]

  • 🛠 Fixed exception when changing format in the case when out_subfmt is defined and is incompatible with the new format. [#9812]

  • 🛠 Fixed exceptions in Time.to_value(): when supplying any subfmt argument for string-based formats like 'iso', and for subfmt='long' for the formats 'byear', 'jyear', and 'decimalyear'. [#9812]

  • 🛠 Fixed bug where the location attribute was lost when creating a new Time object from an existing Time or list of Time objects. [#9969]

  • 🛠 Fixed a bug where an exception occurred when creating a Time object if the val1 argument was a regular double and the val2 argument was a longdouble. [#10034]

  astropy.timeseries

  • 🛠 Fixed issue with reference time for the transit_time parameter returned by the BoxLeastSquares periodogram. Now, the transit_time will be within the range of the input data and arbitrary time offsets/zero points no longer affect results. [#10013]

  astropy.units ^{^}

  • 🛠 Fix for quantity_input annotation raising an exception on iterable types that don't define a general __contains__ for checking if None is contained (e.g. Enum as of python3.8), by instead checking for instance of Sequence. [#9948]

  • 🛠 Fix for u.Quantity not taking into account ndmin if constructed from another u.Quantity instance with different but convertible unit [#10066]

  astropy.utils ^{^}

  • 📇 Fixed deprecated_renamed_argument not passing in user value to deprecated keyword when the keyword has no new name. [#9981]

  • 📇 Fixed deprecated_renamed_argument not issuing a deprecation warning when deprecated keyword without new name is passed in as positional argument. [#9985]

  • 🛠 Fixed detection of read-only filesystems in the caching code. [#10007]

  astropy.visualization

  • 🛠 Fixed bug from matplotlib >=3.1 where an empty Quantity array is sent for unit conversion as an empty list. [#9848]

  • 🛠 Fix bug in ZScaleInterval to return the array minimum and maximum when there are less then min_npixels in the input array. [#9913]

  • 🛠 Fix a bug in simplifying axis labels that affected non-rectangular frames. [#8004, #9991]

  Other Changes and Additions

  • Increase minimum asdf version to 2.5.2. [#9996, #9819]

  • ⚡️ Updated wcslib to v7.2. [#10021]

• v4.0.1.post1

  April 02, 2020

• v4.0

  December 16, 2019

  🆕 New Features

  astropy.config ^{^}

  • The config and cache directories and the name of the config file are now customizable. This allows affiliated packages to put their configuration files in locations other than CONFIG_DIR/.astropy/. [#8237]

  astropy.constants

  • The version of constants can be specified via ScienceState in a way that constants and units will be consistent. [#8517]

  • 0️⃣ Default constants now use CODATA 2018 and IAU 2015 definitions. [#8761]

  • Constants can be pickled and unpickled. [#9377]

  astropy.convolution

  • 🛠 Fixed a bug [#9168] where having a kernel defined using unitless astropy quantity objects would result in a crash [#9300]

  astropy.coordinates

  • Changed coordinates.solar_system_ephemeris to also accept local files as input. The ephemeris can now be selected by either keyword (e.g. 'jpl', 'de430'), URL or file path. [#8767]

  • ➕ Added a cylindrical property to SkyCoord for shorthand access to a CylindricalRepresentation of the coordinate, as is already available for other common representations. [#8857]

  • 0️⃣ The default parameters for the Galactocentric frame are now controlled by a ScienceState subclass, galactocentric_frame_defaults. New parameter sets will be added to this object periodically to keep up with ever-improved measurements of the solar position and motion. [#9346]

  • Coordinate frame classes can now have multiple aliases by assigning a list of aliases to the class variable name. Any of the aliases can be used for attribute-style access or as the target of tranform_to() calls. [#8834]

  • ⚠ Passing a NaN to Distance no longer raises a warning. [#9598]

  astropy.cosmology

  • The pre-publication Planck 2018 cosmological parameters are included as the Planck2018_arXiv_v2 object. Please note that the values are preliminary, and when the paper is accepted a final version will be included as Planck18. [#8111]

  astropy.io.ascii ^{^}

  • ✂ Removed incorrect warnings on Overflow when reading in FloatType 0.0 with use_fast_converter; synchronised IntType Overflow warning messages. [#9082]

  astropy.io.misc ^{^}

  • 📇 Eliminate deprecated compatibility mode when writing Table metadata to HDF5 format. [#8899]

  • ➕ Add support for orthogonal polynomial models to ASDF. [#9107]

  astropy.io.fits ^{^}

  • 🔄 Changed the fitscheck and fitsdiff script to use the argparse module instead of optparse. [#9148]

  • 👍 Allow writing of Table objects with Time columns that are also table indices to FITS files. [#8077]

  astropy.io.votable

  • 👌 Support VOTable version 1.4. The main addition is the new element, TIMESYS, which allows defining of metadata for temporal coordinates much like COOSYS defines metadata for celestial coordinates. [#9475]

  astropy.logger ^{^}

  • ➕ Added a configuration option to specify the text encoding of the log file, with the default behavior being the platform-preferred encoding. [#9203]

  astropy.modeling ^{^}

  • 📚 Major rework of modeling internals. See modeling documentation for details. <https://docs.astropy.org/en/v4.0.x/modeling/changes_for_4.html>_ . [#8769]

  • ➕ Add Tabular1D.inverse. [#9083]

  • Model.rename was changed to add the ability to rename Model.inputs and Model.outputs. [#9220]

  • 🆕 New function fix_inputs to generate new models from others by fixing specific inputs variable values to constants. [#9135]

  • inputs and outputs are now model instance attributes, and n_inputs and n_outputs are class attributes. Backwards compatible default values of inputs and outputs are generated. Model.inputs and Model.outputs are now settable which allows renaming them on per user case. [#9298]

  • ➕ Add a new model representing a sequence of rotations in 3D around an arbitrary number of axes. [#9369]

  • ➕ Add many of the numpy ufunc functions as models. [#9401]

  • ➕ Add BlackBody model. [#9282]

  • ➕ Add Drude1D model. [#9452]

  • ➕ Added analytical King model (KingProjectedAnalytic1D). [#9084]

  • ➕ Added Exponential1D and Logarithmic1D models. [#9351]

  astropy.nddata ^{^}

  • ➕ Add a way for technically invalid but unambiguous units in a fits header to be parsed by CCDData. [#9397]

  • NDData now only accepts WCS objects which implement either the high, or low level APE 14 WCS API. All WCS objects are converted to a high level WCS object, so NDData.wcs now always returns a high level APE 14 object. Not all array slices are valid for wcs objects, so some slicing operations which used to work may now fail. [#9067]

  astropy.stats ^{^}

  • The biweight_location, biweight_scale, and biweight_midvariance functions now allow for the axis keyword to be a tuple of integers. [#9309]

  • Added an ignore_nan option to the biweight_location, biweight_scale, and biweight_midvariance functions. [#9457]

  • A numpy MaskedArray can now be input to the biweight_location, biweight_scale, and biweight_midvariance functions. [#9466]

  • ✂ Removed the warning related to p0 in the Bayesian blocks algorithm. The caveat related to p0 is described in the docstring for Events. [#9567]

  astropy.table ^{^}

  • 👌 Improved the implementation of Table.replace_column() to provide a speed-up of 5 to 10 times for wide tables. The method can now accept any input which convertible to a column of the correct length, not just Column subclasses. [#8902]

  • 👌 Improved the implementation of Table.add_column() to provide a speed-up of 2 to 10 (or more) when adding a column to tables, with increasing benefit as the number of columns increases. The method can now accept any input which is convertible to a column of the correct length, not just Column subclasses. [#8933]

  • 🔄 Changed the implementation of Table.add_columns() to use the new Table.add_column() method. In most cases the performance is similar or slightly faster to the previous implemenation. [#8933]

  • MaskedColumn.data will now return a plain MaskedArray rather than the previous (unintended) masked_BaseColumn. [#8855]

  • ➕ Added depth-wise stacking dstack() in higher level table operation. It help will in stacking table column depth-wise. [#8939]

  • ➕ Added a new table equality method values_equal() which allows comparison table values to another table, list, or value, and returns an element-by-element equality table. [#9068]

  • ➕ Added new join_type='cartesian' option to the join operation. [#9288]

  • 👍 Allow adding a table column as a list of mixin-type objects, for instance t['q'] = [1 * u.m, 2 * u.m]. [#9165]

  • 👍 Allow table join() using any sortable key column (e.g. Time), not just ndarray subclasses. A column is considered sortable if there is a <column>.info.get_sortable_arrays() method that is implemented. [#9340]

  • ➕ Added Table.iterrows() for making row-wise iteration faster. [#8969]

  • 👍 Allow table to be initialized with a list of dict where the dict keys are not the same in every row. The table column names are the set of all keys found in the input data, and any missing key/value pairs are turned into missing data in the table. [#9425]

  • ⚠ Prevent unnecessary ERFA warnings when indexing by Time columns. [#9545]

  • ➕ Added support for sorting tables which contain non-mutable mixin columns (like SkyCoord) for which in-place item update is not allowed. [#9549]

  • Ensured that inserting np.ma.masked (or any other value with a mask) into a MaskedColumn causes a masked entry to be inserted. [#9623]

  • 🛠 Fixed a bug that caused an exception when initializing a MaskedColumn from another MaskedColumn that has a structured dtype. [#9651]

  ✅ astropy.tests ^{^}

  • ✅ The plugin that handles the custom header in the test output has been moved to the pytest-astropy-header plugin package. See the README at <https://github.com/astropy/pytest-astropy-header>__ for information about using this new plugin. [#9214]

  astropy.time ^{^}

  • ➕ Added a new time format ymdhms for representing times via year, month, day, hour, minute, and second attributes. [#7644]

  • TimeDelta gained a to_value method, so that it becomes easier to use it wherever a Quantity with units of time could be used. [#8762]

  • Made scalar Time and TimeDelta objects hashable based on JD, time scale, and location attributes. [#8912]

  • 👌 Improved error message when bad input is used to initialize a Time or TimeDelta object and the format is specified. [#9296]

  • 👍 Allow numeric time formats to be initialized with numpy longdouble, Decimal instances, and strings. One can select just one of these using in_subfmt. The output can be similarly set using out_subfmt. [#9361]

  • Introduce a new .to_value() method for Time (and adjusted the existing method for TimeDelta) so that one can get values in a given format and possible subfmt (e.g., to_value('mjd', 'str'). [#9361]

  • ⚠ Prevent unecessary ERFA warnings when sorting Time objects. [#9545]

  astropy.timeseries

  • Addig epoch_phase, wrap_phase and normalize_phase keywords to TimeSeries.fold() to control the phase of the epoch and to return normalized phase rather than time for the folded TimeSeries. [#9455]

  astropy.uncertainty

  • 👍 Distribution was rewritten such that it deals better with subclasses. As a result, Quantity distributions now behave correctly with to methods yielding new distributions of the kind expected for the starting distribution, and to_value yielding NdarrayDistribution instances. [#9429, #9442]

  • The pdf_* properties that were used to calculate statistical properties of Distrubution instances were changed into methods. This allows one to pass parameters such as ddof to pdf_std and pdf_var (which generally should equal 1 instead of the default 0), and reflects that these are fairly involved calcuations, not just "properties". [#9613]

  astropy.units ^{^}

  • 👌 Support for unicode parsing. Currently supported are superscripts, Ohm, Ångström, and the micro-sign. [#9348]

  • Accept non-unit type annotations in @quantity_input. [#8984]

  • For numpy 1.17 and later, the new __array_function__ protocol is used to ensure that all top-level numpy functions interact properly with Quantity, preserving units also in operations like np.concatenate. [#8808]

  • ➕ Add equivalencies for surface brightness units to spectral_density. [#9282]

  astropy.utils ^{^}

  • astropy.utils.data.download_file and astropy.utils.data.get_readable_fileobj now provides an http_headers keyword to pass in specific request headers for the download. It also now defaults to providing User-Agent: Astropy and Accept: */* headers. The default User-Agent value can be set with a new astropy.data.conf.default_http_user_agent configuration item. [#9508, #9564]

  • ➕ Added a new astropy.utils.misc.unbroadcast function which can be used to return the smallest array that can be broadcasted back to the initial array. [#9209]

  • The specific IERS Earth rotation parameter table used for time and coordinate transformations can now be set, either in a context or per session, using astropy.utils.iers.earth_rotation_table. [#9244]

  • Added export_cache and import_cache to permit transporting downloaded data to machines with no Internet connection. Several new functions are available to investigate the cache contents; e.g., check_download_cache can be used to confirm that the persistent cache has not become damaged. [#9182]

  • A new astropy.utils.iers.LeapSeconds class has been added to track leap seconds. [#9365]

  astropy.visualization

  • ➕ Added a new time_support context manager/function for making it easy to plot and format Time objects in Matplotlib. [#8782]

  • ➕ Added support for plotting any WCS compliant with the generalized (APE 14) WCS API with WCSAxes. [#8885, #9098]

  • 👌 Improved display of information when inspecting WCSAxes.coords. [#9098]

  • 👌 Improved error checking for the slices= argument to WCSAxes. [#9098]

  • ➕ Added support for more solar frames in WCSAxes. [#9275]

  • ➕ Add support for one dimensional plots to WCSAxes. [#9266]

  • Add a get_format_unit to wcsaxes.CoordinateHelper. [#9392]

  • 0️⃣ WCSAxes now, by default, sets a default label for plot axes which is the WCS physical type (and unit) for that axis. This can be disabled using the coords[i].set_auto_axislabel(False) or by explicitly setting an axis label. [#9392]

  • 🛠 Fixed the display of tick labels when plotting all sky images that have a coord_wrap less than 360. [#9542]

  astropy.wcs ^{^}

  • Added a astropy.wcs.wcsapi.pixel_to_pixel function that can be used to transform pixel coordinates in one dataset with a WCS to pixel coordinates in another dataset with a different WCS. This function is designed to be efficient when the input arrays are broadcasted views of smaller arrays. [#9209]

  • Added a local_partial_pixel_derivatives function that can be used to determine a matrix of partial derivatives of each world coordinate with respect to each pixel coordinate. [#9392]

  • ⚡️ Updated wcslib to v6.4. [#9125]

  • 👌 Improved the SlicedLowLevelWCS class in astropy.wcs.wcsapi to avoid storing chains of nested SlicedLowLevelWCS objects when applying multiple slicing operations in turn. [#9210]

  • Added a wcs_info_str function to astropy.wcs.wcsapi to show a summary of an APE-14-compliant WCS as a string. [#8546, #9207]

  • ➕ Added two new optional attributes to the APE 14 low-level WCS: pixel_axis_names and world_axis_names. [#9156]

  • ⚡️ Updated the WCS class to now correctly take and return Time objects in the high-level APE 14 API (e.g. pixel_to_world. [#9376]

  • SlicedLowLevelWCS now raises IndexError rather than ValueError on an invalid slice. [#9067]

  • Added fit_wcs_from_points function to astropy.wcs.utils. Fits a WCS object to set of matched detector/sky coordinates. [#9469]

  • 🛠 Fix various bugs in SlicedLowLevelWCS when the WCS being sliced was one dimensional. [#9693]

  API Changes

  astropy.constants

  • Deprecated set_enabled_constants context manager. Use astropy.physical_constants and astropy.astronomical_constants. [#9025]

  astropy.convolution

  • ✂ Removed the deprecated keyword argument interpolate_nan from convolve_fft. [#9356]

  • ✂ Removed the deprecated keyword argument stddev from Gaussian2DKernel. [#9356]

  • 🗄 Deprecated and renamed MexicanHat1DKernel and MexicanHat2DKernel to RickerWavelet1DKernel and RickerWavelet2DKernel. [#9445]

  astropy.coordinates

  • ✂ Removed the recommended_units attribute from Representations; it was deprecated since 3.0. [#8892]

  • ✂ Removed the deprecated frame attribute classes, FrameAttribute, TimeFrameAttribute, QuantityFrameAttribute, CartesianRepresentationFrameAttribute; deprecated since 3.0. [#9326]

  • ✂ Removed longitude and latitude attributes from EarthLocation; deprecated since 2.0. [#9326]

  • The DifferentialAttribute for frame classes now passes through any input to the allowed_classes if only one allowed class is specified, i.e. this now allows passing a quantity in for frame attributes that use DifferentialAttribute. [#9325]

  • Removed the deprecated galcen_ra and galcen_dec attributes from the Galactocentric frame. [#9346]

  astropy.extern ^{^}

  • ✂ Remove the bundled six module. [#8315]

  astropy.io.ascii ^{^}

  • 👀 Masked column handling has changed, see astropy.table entry below. [#8789]

  astropy.io.misc ^{^}

  • 👀 Masked column handling has changed, see astropy.table entry below. [#8789]

  • ✂ Removed deprecated usecPickle kwarg from fnunpickle and fnpickle. [#8890]

  astropy.io.fits ^{^}

  • 👀 Masked column handling has changed, see astropy.table entry below. [#8789]

  • io.fits.Header has been made safe for subclasses for copying and slicing. As a result of this change, the private subclass CompImageHeader now always should be passed an explicit image_header. [#9229]

  • ✂ Removed the deprecated tolerance option in fitsdiff and io.fits.diff classes. [#9520]

  • ✂ Removed deprecated keyword arguments for CompImageHDU: compressionType, tileSize, hcompScale, hcompSmooth, quantizeLevel. [#9520]

  astropy.io.votable

  • 🔄 Changed pedantic argument to verify and change it to have three string-based options (ignore, warn, and exception) instead of just being a boolean. In addition, changed default to ignore, which means that warnings will not be shown by default when loading VO tables. [#8715]

  astropy.modeling ^{^}

  • 👍 Eliminates support for compound classes (but not compound instances!) [#8769]

  • Slicing compound models more restrictive. [#8769]

  • Shape of parameters now includes n_models as dimension. [#8769]

  • Parameter instances now hold values instead of models. [#8769]

  • Compound model parameters now share instance and value with constituent models. [#8769]

  • No longer possible to assign slices of parameter values to model parameters attribute (it is possible to replace it with a complete array). [#8769]

  • 📚 Many private attributes and methods have changed (see documentation). [#8769]

  • 🗄 Deprecated BlackBody1D model and blackbody_nu and blackbody_lambda functions. [#9282]

  • The deprecated rotations.rotation_matrix_from_angle was removed. [#9363]

  • 🗄 Deprecated and renamed MexicanHat1D and MexicanHat2D to RickerWavelet1D and RickerWavelet2D. [#9445]

  • 🗄 Deprecated modeling.utils.ExpressionTree. [#9576]

  astropy.stats ^{^}

  • ✂ Removed the iters keyword from sigma clipping stats functions. [#8948]

  • 📇 Renamed the a parameter to data in biweight stat functions. [#8948]

  • Renamed the a parameter to data in median_absolute_deviation. [#9011]

  • 📇 Renamed the conflevel keyword to confidence_level in poisson_conf_interval. Usage of conflevel now issues AstropyDeprecationWarning. [#9408]

  • 📇 Renamed the conf keyword to confidence_level in binom_conf_interval and binned_binom_proportion. Usage of conf now issues AstropyDeprecationWarning. [#9408]

  • Renamed the conf_lvl keyword to confidence_level in jackknife_stats. Usage of conf_lvl now issues AstropyDeprecationWarning. [#9408]

  astropy.table ^{^}

  • The handling of masked columns in the Table class has changed in a way that may impact program behavior. Now a Table with masked=False may contain both Column and MaskedColumn objects, and adding a masked column or row to a table no longer "upgrades" the table and columns to masked. This means that tables with masked data which are read via Table.read() will now always have masked=False, though specific columns will be masked as needed. Two new table properties has_masked_columns and has_masked_values were added. See the Masking change in astropy 4.0 section within <https://docs.astropy.org/en/v4.0.x/table/masking.html>_ for details. [#8789]

  • Table operation functions such as join, vstack, hstack, etc now always return a table with masked=False, though the individual columns may be masked as necessary. [#8957]

  • Changed implementation of Table.add_column() and Table.add_columns() methods. Now it is possible add any object(s) which can be converted or broadcasted to a valid column for the table. Table.__setitem__ now just calls add_column. [#8933]

  • 🔄 Changed default table configuration setting replace_warnings from ['slice'] to []. This removes the default warning when replacing a table column that is a slice of another column. [#9144]

  • ✂ Removed the non-public method astropy.table.np_utils.recarray_fromrecords. [#9165]

  ✅ astropy.tests ^{^}

  • 🗄 In addition to DeprecationWarning, now FutureWarning and ImportWarning would also be turned into exceptions. [#8506]

  • warnings_to_ignore_by_pyver option in enable_deprecations_as_exceptions() has changed. Please refer to API documentation. [#8506]

  • Default settings for warnings_to_ignore_by_pyver are updated to remove very old warnings that are no longer relevant and to add a new warning caused by pytest-doctestplus. [#8506]

  astropy.time ^{^}

  • Time.get_ut1_utc now uses the auto-updated IERS_Auto by default, instead of the bundled IERS_B file. [#9226]

  • Time formats that do not use val2 now raise ValueError instead of silently ignoring a provided value. [#9373]

  • Custom time formats can now accept floating-point types with extended precision. Existing time formats raise exceptions rather than discarding extended precision through conversion to ordinary floating-point. [#9368]

  • Time formats (implemented in subclasses of TimeFormat) now have their input and output routines more thoroughly validated, making it more difficult to create damaged Time objects. [#9375]

  • The TimeDelta.to_value() method now can also take the format name as its argument, in which case the value will be calculated using the TimeFormat machinery. For this case, one can also pass a subfmt argument to retrieve the value in another form than float. [#9361]

  astropy.timeseries

  • Keyword midpoint_epoch is renamed to epoch_time. [#9455]

  astropy.uncertainty

  • 👍 Distribution was rewritten such that it deals better with subclasses. As a result, Quantity distributions now behave correctly with to methods yielding new distributions of the kind expected for the starting distribution, and to_value yielding NdarrayDistribution instances. [#9442]

  astropy.units ^{^}

  • For consistency with ndarray, scalar Quantity.value will now return a numpy scalar rather than a python one. This should help keep track of precision better, but may lead to unexpected results for the rare cases where numpy scalars behave differently than python ones (e.g., taking the square root of a negative number). [#8876]

  • Removed the magnitude_zero_points module, which was deprecated in favour of astropy.units.photometric since 3.1. [#9353]

  • EquivalentUnitsList now has a _repr_html_ method to output a HTML table on a call to find_equivalent_units in Jupyter notebooks. [#9495]

  astropy.utils ^{^}

  • download_file and related functions now accept a list of fallback sources, and they are able to update the cache at the user's request. [#9182]

  • 👍 Allow astropy.utils.console.ProgressBarOrSpinner.map and .map_unordered to take an argument multiprocessing_start_method to control how subprocesses are started; the different methods (fork, spawn, and forkserver) have different implications in terms of security, efficiency, and behavioural anomalies. The option is useful in particular for cross-platform testing because Windows supports only spawn while Linux defaults to fork. [#9182]

  • All operations that act on the astropy download cache now take an argument pkgname that allows one to specify which package's cache to use. [#8237, #9182]

  • ✂ Removed deprecated funcsigs and futures from astropy.utils.compat. [#8909]

  • ✂ Removed the deprecated astropy.utils.compat.numpy module. [#8910]

  • 🗄 Deprecated InheritDocstrings as it is natively supported by Sphinx 1.7 or higher. [#8881]

  • 🚚 Deprecated astropy.utils.timer module, which has been moved to astroquery.utils.timer and will be part of astroquery 0.4.0. [#9038]

  • 🗄 Deprecated astropy.utils.misc.set_locale function, as it is meant for internal use only. [#9471]

  • The implementation of data_info.DataInfo has changed (for a considerable performance boost). Generally, this should not affect simple subclasses, but because the class now uses __slots__ any attributes on the class have to be explicitly given a slot. [#8998]

  • IERS tables now use nan to mark missing values (rather than 1e20). [#9226]

  astropy.visualization

  • 0️⃣ The default clip value is now False in ImageNormalize. [#9478]

  • 0️⃣ The default clip value is now False in simple_norm. [#9698]

  • Infinite values are now excluded when calculating limits in ManualInterval and MinMaxInterval. They were already excluded in all other interval classes. [#9480]

  🐛 Bug Fixes

  astropy.convolution

  • Fixed nan_treatment='interpolate' option to convolve_fft to properly take into account fill_value. [#8122]

  astropy.coordinates

  • 0️⃣ The QuantityAttribute class now supports a None default value if a unit is specified. [#9345]

  • When Representation classes with the same name are defined, this no longer leads to a ValueError, but instead to a warning and the removal of both from the name registry (i.e., one either has to use the class itself to set, e.g., representation_type, or refer to the class by its fully qualified name). [#8561]

  astropy.io.fits ^{^}

  • ⚠ Implemented skip (after warning) of header cards with reserved keywords in table_to_hdu. [#9390]

  • Add AstropyDeprecationWarning to read_table_fits when hdu= is selected, but does not match single present table HDU. [#9512]

  astropy.io.votable

  • ➕ Address issue #8995 by ignoring BINARY2 null mask bits for string values on parsing a VOTable. In this way, the reader should never create masked values for string types. [#9057]

  • ⚠ Corrected a spurious warning issued for the value attribute of the <OPTION> element in VOTable, as well as a test that erroneously treated the warning as acceptable. [#9470]

  astropy.nddata ^{^}

  • Cutout2D will now get the WCS from its first argument if that argument has with WCS property. [#9492]

  • overlap_slices will now raise a ValueError if the input position contains any non-finite values (e.g. NaN or inf). [#9648]

  astropy.stats ^{^}

  • 🛠 Fixed a bug where bayesian_blocks returned a single edge. [#8560]

  • 🛠 Fixed input data type validation for bayesian_blocks to work int arrays. [#9513]

  astropy.table ^{^}

  • 🛠 Fix bug where adding a column consisting of a list of masked arrays was dropping the masks. [#9048]

  • Quantity columns with custom units can now round-trip via FITS tables, as long as the custom unit is enabled during reading (otherwise, the unit will become an UnrecognizedUnit). [#9015]

  • 🛠 Fix bug where string values could be truncated when inserting into a Column or MaskedColumn, or when adding or inserting a row containing string values. [#9559]

  astropy.time ^{^}

  • 🛠 Fix bug when Time object is created with only masked elements. [#9624]

  • 🛠 Fix inaccuracy when converting between TimeDelta and datetime.timedelta. [#9679]

  astropy.units ^{^}

  • ✅ Ensure that output from test functions of and comparisons between quantities can be stored into pre-allocated output arrays (using out=array) [#9273]

  astropy.utils ^{^}

  • 0️⃣ For the default IERS_Auto table, which combines IERS A and B values, the IERS nutation parameters "dX_2000A" and "dY_2000A" are now also taken from the actual IERS B file rather than from the B values stored in the IERS A file. Any differences should be negligible for any practical application, but this may help exactly reproducing results. [#9237]

  astropy.visualization

  • Calling WCSAxes.set_axis_off() now correctly turns off drawing the Axes. [#9411]

  • 🛠 Fix incorrect transformation behavior in WCSAxes.plot_coord and correctly handle when input coordinates are not already in spherical representations. [#8927]

  • 🛠 Fixed ImageNormalize so that when it is intialized without data it will still use the input interval class. [#9698]

  • 🛠 Fixed ImageNormalize to handle input data with non-finite values. [#9698]

  astropy.wcs ^{^}

  • 🛠 Fix incorrect value returned by wcsapi.HighLevelWCSWrapper.axis_correlation_matrix. [#9554]

  • 🛠 Fix NaN-masking of world coordinates when some but not all of the coordinates were flagged as invalid by WCSLIB. This occurred for example with WCS with >2 dimensions where two of the dimensions were celestial coordinates and pixel coordinates ouside of the 'sky' were converted to world coordinates - previously all world coordinates were masked even if uncorrelated with the celestial axes, but this is no longer the case. [#9688]

  • 0️⃣ The default WCS to celestial frame mapping for world coordinate systems that specify TLON and TLAT coordinates will now return an ITRS frame with the representation class set to SphericalRepresentation. This fixes a bug that caused WCS.pixel_to_world to raise an error for such world coordinate systems. [#9609]

  • FITSWCSAPIMixin now returns tuples not lists from pixel_to_world and world_to_pixel. [#9678]

  Other Changes and Additions

  • 🔖 Versions of Python <3.6 are no longer supported. [#8955]

  • Matplotlib 2.1 and later is now required. [#8787]

  • 🔖 Versions of Numpy <1.16 are no longer supported. [#9292]

  • ⚡️ Updated the bundled CFITSIO library to 3.470. See cextern/cfitsio/docs/changes.txt for additional information. [#9233]

  • ⚡️ The bundled ERFA was updated to version 1.7.0. This is based on SOFA 20190722. This includes a fix to avoid precision loss for negative JDs, and also includes additional routines to allow updates to the leap-second table. [#9323, #9734]

  • ⚡️ The default server for the IERS data files has been updated to reflect long-term downtime of the canonical USNO server. [#9487, #9508]

• v4.0.rc2

  December 07, 2019

• v4.0.rc1

  November 19, 2019

• v3.2.3

  October 27, 2019

  Other Changes and Additions

  • ⚡️ Updated IERS A URLs due to USNO prolonged maintenance. [#9443]

• v3.2.2

  October 07, 2019

  🐛 Bug fixes

  astropy.convolution

  • Fixed a bug in discretize_oversample_1D/2D() from astropy.convolution.utils, which might occasionally introduce unexpected oversampling grid dimensions due to a numerical precision issue. [#9293]

  • 🛠 Fixed a bug [#9168] where having a kernel defined using unitless astropy quantity objects would result in a crash [#9300]

  astropy.coordinates

  • 🛠 Fix concatenation of representations for cases where the units were different. [#8877]

  • 🏗 Check for NaN values in catalog and match coordinates before building and querying the KDTree for coordinate matching. [#9007]

  • 🛠 Fix sky coordinate matching when a dimensionless distance is provided. [#9008]

  • Raise a faster and more meaningful error message when differential data units are not compatible with a containing representation's units. [#9064]

  • 🔄 Changed the timescale in ICRS to CIRS from 'tdb' to 'tt' conversion and vice-versa, as the erfa function that gets called in the process, pnm06a accepts time in TT. [#9079]

  astropy.io.ascii ^{^}

  • 🛠 Fixed the fast reader when used in parallel and with the multiprocessing 'spawn' method (which is the default on MacOS X with Python 3.8 and later), and enable parallel fast reader on Windows. [#8853]

  astropy.io.fits ^{^}

  • 🛠 Fixes bug where an invalid TRPOS keyword was being generated for FITS time column when no location was available. [#8784]

  • 🛠 Fixed a wrong exception when converting a Table with a unit that is not FITS compliant and not convertible to a string using format='fits'. [#8906]

  • 🛠 Fixed an issue with A3DTABLE extension that could not be read. [#9012]

  • 🛠 Fixed the update of the header when creating GroupsHDU from data. [#9216]

  astropy.nddata ^{^}

  • Fix to add_array, which now accepts array_small having dimensions equal to array_large, instead of only allowing smaller sizes of arrays. [#9118]

  astropy.stats ^{^}

  • Fixed median_absolute_deviation for the case where ignore_nan=True and an input masked array contained both NaNs and infs. [#9307]

  astropy.table ^{^}

  • Comparisons between Column instances and Quantity will now correctly take into account the unit (as was already the case for regular operations such as addition). [#8904]

  astropy.time ^{^}

  • 👍 Allow Time to be initialized with an empty value for all formats. [#8854]

  • 🛠 Fixed a troubling bug in which Time could loose precision, with deviations of 300 ns. [#9328]

  astropy.timeseries

  • 🛠 Fixed handling of Quantity input data for all methods of LombScarge.false_alarm_probabilty. [#9246]

  astropy.units ^{^}

  • 👍 Allow conversion of Column with logarithmic units to a suitable Quantity subclass if subok=True. [#9188]

  • Ensured that we simplify powers to smaller denominators if that is consistent within rounding precision. [#9267]

  • Ensured that the powers shown in a unit's repr are always correct, not oversimplified. [#9267]

  astropy.utils ^{^}

  • Fixed find_api_page access by using custom request headers and HTTPS when version is specified. [#9032]

  • Make download_file (and by extension get_readable_fileobj and others) check the size of downloaded files against the size claimed by the server. [#9302]

  • Fix find_current_module so that it works properly if astropy is being used inside a bundle such as that produced by PyInstaller. [#8845]

  • 🛠 Fix path to renamed classes, which previously included duplicate path/module information under certain circumstances. [#8845]

  astropy.visualization

  • ⚠ Silence numpy runtime warnings in WCSAxes when drawing grids. [#8882]

  astropy.wcs ^{^}

  • 🛠 Fixed equality test between cunit where the first element was equal but the following elements differed. [#9154]

  • 🛠 Fixed a crash while loading a WCS from headers containing duplicate SIP keywords. [#8893]

  • 🛠 Fixed a possible buffer overflow when using too large negative indices for cunit or ctype [#9151]

  • Fixed reference counting in WCSBase.__init__ [#9166]

  • Fix SlicedLowLevelWCS world_to_pixel_values and pixel_to_world_values when inputs need broadcasting to the same shape. (i.e. when one input is sliced out) [#9250]

  • Fixed a bug that caused WCS.array_shape, WCS.pixel_shape and WCS.pixel_bounds to be incorrect after using WCS.sub. [#9095]

  Other Changes and Additions

  • 🛠 Fixed a bug that caused files outside of the astropy module directory to be included as package data, resulting in some cases in errors when doing repeated builds. [#9039]

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