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Latest Release
307 days ago

## Changelog History Page 8

• ### v1.0.5 Changes

October 05, 2015

## 🐛 Bug Fixes

astropy.constants

• 📇 Rename units -> unit and error -> uncertainty in the repr and str of constants to match attribute names. [#4147]

astropy.coordinates

• 🛠 Fix string representation of SkyCoord objects transformed into the AltAz frame [#4055, #4057]

• Fix the search_around_sky function to allow storekdtree to be False as was intended. [#4082, #4212]

astropy.io.fits ^

• Somewhat improved resource usage for FITS data--previously a new mmap was opened for each HDU of a FITS file accessed through an HDUList. Each mmap used up a single file descriptor, causing problems with system resource limits for some users. Now only a single mmap is opened, and shared for the data of all HDUs. Note: The problem still persists with using the "convenience" functions. For example using fits.getdata will create one mmap per HDU read this way (as opposed to opening the file with fits.open and accessing the HDUs through the HDUList object). [#4097]

• 🛠 Fix bug where reading a file without a newline failed with an unrelated / unhelpful exception. [#4160]

astropy.modeling ^

• Cleaned up repr of models that have no parameters. [#4076]

astropy.nddata ^

• 🎉 Initializing NDDataArray from another instance now sets flags as expected and no longer fails when uncertainty is set [#4129]. Initializing an NDData subclass from a parent instance (eg. NDDataArray from NDData) now sets the attributes other than data as it should [#4130, #4137].

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 causes sys.modules to be cluttered with additional copies of modules under a package imported like resolve_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

• The color for axes labels was set to white. Since white labels on white background are hard to read, the label color has been changed to black. [#4143]

• ImageNormalize now automatically determines vmin/vmax (via the autoscale_None method) when they have not been set explicitly. [#4117]

astropy.vo ^

• Cone Search validation no longer crashes when the provider gives an incomplete test query. It also ensures search radius for a test query is not too large to avoid timeout. [#4158, #4159]

• 👍 Astropy now supports Python 3.5. [#4027]

• ⚡️ Updated bundled version of astropy-helpers to 1.0.5. [#4215]

• ⚡️ Updated tests to support py.test 2.7, and upgraded the bundled copy of py.test to v2.7.3. [#4027]

• ### v1.0.4 Changes

August 11, 2015

## 🆕 New Features

astropy.convolution

• 🚀 Modified Cython functions to release the GIL. This enables convolution to be parallelized effectively and gives large speedups when used with multithreaded task schedulers such as Dask. [#3949]

## API Changes

astropy.coordinates

• Some transformations for an input coordinate that's a scalar now correctly return a scalar. This was always the intended behavior, but it may break code that has been written to work-around this bug, so it may be viewed as an unplanned API change [#3920, #4039]

astropy.visualization

• The astropy_mpl_style no longer sets interactive to True, but instead leaves it at the user preference. This makes using the style compatible with building docs with Sphinx, and other non-interactive contexts. [#4030]

## 🐛 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 of SkyCoord 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 the SkyCoord constructor appropriately yields a new object in UnitSphericalRepresentation [#3938, #4039]

astropy.cosmology

• 🛠 Fixed wCDM to not ignore the Ob0 parameter on initialization. [#3934]

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. The BLANK 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 the scale_back=True argument. Invalid usage of the BLANK 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 ^

• 👌 Improved support for pickling of compound models, including both compound model instances, and new compound model classes. [#3867]

• ➕ Added missing default values for Ellipse2D parameters. [#3903]

astropy.time ^

• 🛠 Fixed iteration of scalar Time objects so that iter() correctly raises a TypeError on them (while still allowing Time arrays to be iterated). [#4048]

astropy.units ^

• ➕ Added frequency-equivalency check when declaring doppler equivalencies [#3728]

• Define floor_divide (//) for Quantity to be consistent divmod, 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 the assigned 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]

• ### v1.0.3 Changes

June 05, 2015

## 🆕 New Features

astropy.table ^

• 🖨 Greatly improved the speed of printing a large table to the screen when only a few rows are being displayed. [#3796]

astropy.time ^

• ➕ Add support for the 2015-Jun-30 leap second. [#3794]

## 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.convolution

• 🛠 Fix issue with repeated normalizations of Kernels. [#3747]

astropy.coordinates

• 🛠 Fixed get_sun to yield frames with the obstime set to what's passed into the function (previously it incorrectly always had J2000). [#3750]

• 🛠 Fixed get_sun to account for aberration of light. [#3750]

• 🛠 Fixed error in the GCRS->ICRS transformation that gave incorrect distances. [#3750]

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.io.fits ^

• 🛠 Fixes to support the upcoming Numpy 1.10. [#3419]

astropy.modeling ^

• Polynomials are now scaled when used in a compound model. [#3702]

• 🛠 Fixed the Ellipse2D model to be consistent with Disk2D in how pixels are included. [#3736]

• 🛠 Fixed crash when evaluating a model that accepts no inputs. [#3772]

✅ 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 of 1.2000000000000002. After this change, the exact rational number of Fraction(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 the UnitsError exception used previously, so existing code that catches UnitsError should still work. [#3778]

• Added a new astropy.__bibtex__ attribute which gives a citation for Astropy in bibtex format. [#3697]

• ⚡️ The bundled version of ERFA was updated to v1.2.0 to address leapsecond updates. [#3802]

• ### v1.0.2 Changes

April 16, 2015

## 🆕 New Features

astropy.modeling ^

• ➕ Added support for polynomials with degree 0 or degree greater than 15. [#3574, 3589]

## 🐛 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, and ColDefs.change_unit methods now work as advertised. It is also possible (and preferable) to update attributes directly on Column objects (for example setting column.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 a FITS_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 any DATA 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 an array, not as an dimensionless Quantity. [#3648]

astropy.units ^

• Ensure equivalencies that do more than just scale a Quantity are properly handled also in ufunc 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]

astropy.vo ^

• Using HTTPS/SSL for communication between SAMP hubs now works correctly on all supported versions of Python [#3613]

astropy.wcs ^

• When no relax argument is passed to WCS.to_header() and the result omits non-standard WCS keywords, a warning is emitted. [#3652]

astropy.vo ^

• The number of retries for connections in astropy.vo.samp can now be configured by a n_retries configuration option. [#3612]

• ✅ Testing

• ✅ Running astropy.test() from within the IPython prompt has been provisionally re-enabled. [#3184]

• ### v1.0.1 Changes

March 06, 2015

## 🐛 Bug Fixes

astropy.constants

• Ensure constants can be turned into Quantity safely. [#3537, #3538]

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]

astropy.nddata ^

• ⏪ Restore several properties to the compatibility class NDDataArray that were inadvertently omitted [#3466].

astropy.time ^

• Time objects now always evaluate to True, except when empty. [#3530]

## Miscellaneous

• The ERFA wrappers are now written directly in the Python/C API rather than using Cython, for greater performance. [#3521]

• 👌 Improve import time of astropy [#3488].

• ⚡️ Updated bundled astropy-helpers version to v1.0.1 to address installation issues with some packages that depend on Astropy. [#3541]
• ### v1.0 Changes

February 18, 2015

## 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 a get_sun function that gives the coordinates of the Sun at a specified time. [#3217]

• SkyCoord now has to_pixel and from_pixel methods that convert between celestial coordinates as SkyCoord objects and pixel coordinates given an astropy.wcs.WCS object. [#3002]

• SkyCoord now has search_around_sky and search_around_3d convenience methods that allow searching for all coordinates within a certain distance of another SkyCoord. [#2953]

• SkyCoord can now accept a frame instance for the frame= keyword argument. [#3063]

• SkyCoord now has a guess_from_table method that can be used to quickly create SkyCoord objects from an astropy.table.Table object. [#2951]

• astropy.coordinates now has a Galactocentric 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 has ra and dec attributes. [#2920]

• SkyCoord can now accept lists of SkyCoord objects, frame objects, or representation objects and will combine them into a single object. [#3285]

• Frames and SkyCoord instances now have a method is_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 is c * 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 in read and fast_writer in write. [#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 ^

• 0️⃣ 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 by astropy.table. [#2555, #2588]

• 👍 Section now supports all advanced indexing features ndarray 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 a datatype_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 to Model classes that can work within the Astropy modeling framework. This replaces the old custom_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 and Fitter classes have .registry attributes which provide sets of all loaded Model and Fitter classes (this is useful for building UIs for models and fitting). [#2725]

• A dict-like meta member was added to Model. it is to be used to store any optional information which is relevant to a project and is not in the standard Model 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, and NDIOMixin 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 ^

• ➕ Added mad_std() function. [#3208]

• Added gaussian_fwhm_to_sigma and gaussian_sigma_to_fwhm constants. [#3208]

• New function sigma_clipped_stats which can be used to quickly get common statistics for an array, using sigma clipping at the same time. [#3201]

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 and to method were added to Table columns that allow the column values to be easily converted to astropy.units.Quantity objects. [#2950]

• ➕ Add unique convenience method to table. [#3185]

✅ astropy.tests ^

• Added a new Quantity-aware assert_quantity_allclose. [#3273]

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 a Quantity object. This is similar to the numpy.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 for units.au. [#3303]

astropy.utils ^

• ➕ Added a new decorator astropy.utils.wraps which acts as a replacement for the standard library's functools.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 newer numpy versions. The first addition is a version of broadcast_arrays that can be used with Quantity and other ndarray subclasses (using the subok=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 script fits2bitmap 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:

• 0️⃣ equinox and radesys will now be given default values conforming with the WCS specification if EQUINOXa and RADESYSa, 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 a tolerance keyword argument to allow for approximate comparison of floating-point values. [#2503]

• added pixel_scale_matrix, celestial, is_celestial, and has_celestial convenience attributes. Added proj_plane_pixel_scales, proj_plane_pixel_area, and non_celestial_pixel_scales utility functions for retrieving WCS pixel scale and area information [#2832, #3304]

• Added two functions pixel_to_skycoord and skycoord_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 the WCSAxes package. [#3183]

• Added is_proj_plane_distorted for testing if pixels are distorted. [#3329]

Misc ^

• 📦 astropy._erfa was added as a new subpackage wrapping the functionality of the ERFA library in python. This is primarily of use for other astropy subpackages, but the API may be made more public in the future. [#2992]

## API Changes

astropy.coordinates

• Subclasses of BaseCoordinateFrame which define a custom repr should be aware of the format expected in SkyCoord.__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 the astropy.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 and get_current (deprecated in v0.4) have now been removed. [#2990]

astropy.io.ascii ^

• ➕ Added a new argument to htmldict in the HTML reader named parser, 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 like print my_table to be read automatically. Discussed in #3025 and #3099 [#3109]

astropy.io.fits ^

• A new optional argument cache has been added to astropy.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 and outputs class attributes instead of the old n_inputs and n_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 in Model subclasses if all they do is wrap the super-method in order to provide a nice call signature to the docs. The inputs class attribute is now used to generate a nice call signature, so these methods should only be overridden by Model subclasses in order to provide new functionality. [#2835]

• 0️⃣ 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 accessing model.inverse on a model returns a new model that implements that model's inverse, and calling model.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 new custom_model (see "New Features" above). [#1763]

• 🚚 The Model.param_dim property (deprecated in v0.4) has now been removed. [#2990]

• The Beta1D and Beta2D models have been renamed to Moffat1D and Moffat2D. [#3029]

astropy.nddata ^

• 🚚 flags, shape, size, dtype and ndim properties removed from astropy.nddata.NDData. [#2905]

• Arithmetic operations, uncertainty propagation, slicing and automatic conversion to a numpy array removed from astropy.nddata.NDData. The class astropy.nddata.NDDataArray is functionally equivalent to the old NDData. [#2905]

astropy.table ^

• 🚚 The Column.units property (deprecated in v0.3) has now been removed. [#2990]

• 🗄 The Row.data and Table._data attributes have been deprecated related to the change in Table implementation. They are replaced by Row.as_void() and Table.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 numpy MaskedArray. 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 ^

• 🗄 The Time.val and Time.vals properties (deprecated in v0.3) and the Time.lon, and Time.lat properties (deprecated in v0.4) have now been removed. [#2990]

• ➕ Add decimalyear format that represents time as a decimal year. [#3265]

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 for Quantity objects. [#3456]

astropy.utils ^

• 🚚 Some members of astropy.utils.misc were moved into new submodules. Specifically:

• 🗄 deprecated, deprecated_attribute, and lazyproperty -> 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 of astropy.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 an interactive kwarg. [#2658, #2789]

astropy.wcs ^

• 🚚 The WCS.calcFootprint method (deprecated in v0.4) has now been removed. [#2990]

• ⚠ An invalid unit in a CUNITn keyword now displays a warning and returns a UnrecognizedUnit instance rather than raising an exception [#3190]

## 🐛 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 and SphericalRepresentation [#3354, #3366]

• 🛠 Fixed latex display of array angles in IPython notebook. [#3480]

astropy.io.ascii ^

• 0️⃣ In the CommentedHeader the data_start parameter now defaults to 0, 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 in fits.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 the maxiter 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 and table.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 ^

• When creating a Time object from a datetime object the time zone info is now correctly used. [#3160]

• For Time objects, it is now checked that numerical input is finite. [#3396]

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 ^

• 🗄 treat_deprecations_as_exceptions has been fixed to recognize Astropy deprecation warnings. [#3015]

• Converted representation of progress bar units without suffix from float to int in console.human_file_size. [#2201, #2202, #2721, #3299]

astropy.wcs ^

• astropy.wcs.WCS.sub now accepts unicode strings as input on Python 2.x [#3356]

Misc ^

• ✅ Some modules and tests that would crash upon import when using a non-final release of Numpy (e.g. 1.9.0rc1). [#3471]

• ⚡️ The bundled copy of astropy-helpers has been updated to v1.0. [#3515]

• ⚡️ Updated astropy.extern.configobj to Version 5. Version 5 uses six and the same code covers both Python 2 and Python 3. [#3149]

astropy.coordinates

• The repr of SkyCoord and coordinate frame classes now separate frame attributes and coordinate information. [#2704, #2882]

astropy.io.fits ^

• Overwriting an existing file using the clobber=True option no longer displays a warning message. [#1963]

• fits.open no longer catches OSError exceptions on missing or unreadable files-- instead it raises the standard Python exceptions in such cases. [#2756, #2785]

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 of six. [#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 <https://pypi.python.org/pypi/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 <http://jinja.pocoo.org/docs/dev/>_>=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]

May 29, 2015

## 🐛 Bug Fixes

astropy.time ^

• 🛠 Fixed ERFA code to handle the 2015-Jun-30 leap second. [#3795]
• ### v0.4.5 Changes

February 16, 2015

## 🐛 Bug Fixes

• 🛠 Fixed unnecessary attempt to run git when importing astropy. In particular, fixed a crash in Python 3 that could result from this when importing Astropy when the the current working directory is an empty git repository. [#3475]

• ⚡️ Updated bundled copy of astropy-helpers to v0.4.6. [#3508]
• ### v0.4.4 Changes

January 21, 2015

## 🐛 Bug Fixes

astropy.vo.samp ^

• 🏗 astropy.vo.samp is now usable on Python builds that do not support the SSLv3 protocol (which depends both on the version of Python and the version of OpenSSL or LibreSSL that it is built against.) [#3308]

## API Changes

astropy.vo.samp ^

• 0️⃣ The default SSL protocol used is now determined from the default used in the Python ssl standard library. This default may be different depending on the exact version of Python you are using. [#3308]

astropy.wcs ^

• WCS allows slices of the form slice(None, x, y), which previously resulted in an unsliced copy being returned (note: this was previously incorrectly reported as fixed in v0.4.3) [#2909]
• ### v0.4.3 Changes

January 15, 2015

## 🐛 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.cosmology

• The ztol keyword argument to z_at_value now works correctly [#2993].

astropy.io.ascii ^

• 🛠 Fix a bug in Python 3 when guessing file format using a file object as input. Also improve performance in same situation for Python 2. [#3132]

• 🛠 Fix a problem where URL was being downloaded for each guess. [#2001]

astropy.io.fits ^

• The in operator now works correctly for checking if an extension is in an HDUList (as given via EXTNAME, (EXTNAME, EXTVER) tuples, etc.) [#3060]

• ➕ Added workaround for bug in MacOS X <= 10.8 that caused np.fromfile to fail. [#3078]

• ➕ Added support for the RICE_ONE compression type synonym. [#3115]

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 and prepare_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 the ndarray method to give a NotImplementedError (by renaming the previous list method). [#3050]

• Quantity.round now always returns a Quantity (previously it returned an ndarray for decimals>0). [#3062]

• Ensured np.squeeze always returns a Quantity (it only worked if no dimensions were removed). [#3045]

• Input to Quantity with a unit attribute no longer can get mangled with copy=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 ^

• 🛠 Fixed an issue with the deprecated decorator on classes that invoke super() in their __init__ method. [#3004]

• 🛠 Fixed a bug which caused the metadata_conflicts parameter to be ignored in the astropy.utils.metadata.merge function. [#3294]

astropy.vo ^

• 🛠 Fixed an issue with reconnecting to a SAMP Hub. [#2674]

astropy.wcs ^

• Invalid or out of range values passed to wcs_world2pix will now be correctly identified and returned as nan values. [#2965]

• 🛠 Fixed an issue which meant that Python thought WCS objects were iterable. [#3066]

Misc ^

• Astropy will now work if your Python interpreter does not have the bz2 module installed. [#3104]

• 🛠 Fixed ResourceWarning for astropy/extern/bundled/six.py` that could occur sometimes after using Astropy in Python 3.4. [#3156]