What’s New in Astropy 4.2?¶
Overview¶
Astropy 4.2 is a major release that adds new funcionality since the 4.1 release.
In particular, this release includes:
In addition to these major changes, Astropy v4.2 includes smaller improvements and bug fixes and significant cleanup, which are described in the Full Changelog. By the numbers:
183 issues have been closed since v4.1
105 pull requests have been merged since v4.1
63 distinct people have contributed code
Planck 2018 is accepted and now the default cosmology¶
The accepted version of the Planck 2018 cosmological parameters has been included and has become the default cosmology. It is identical to the previous, preliminary version (Planck18_arXiv_v2), which is deprecated and will be removed in a future release.
>>> from astropy.cosmology import Planck18
>>> Planck18.age(0)
<Quantity 13.7868853 Gyr>
Time performance improvements¶
The performance for creating a Time object from a large array of
fixed-format string times was dramatically improved. For ISO and ISOT formats
the speed-up is a factor of 25 and for the year day-of-year format the speedup
is a factor of 50. This is done with a new C-based time string parser which can
also be used for custom user-defined Time formats. For details see
Fast C-based Date String Parser.
In addition the performance for creating a scalar Time object in a epoch
format like unix, unix_tai, or cxcsec was improved by a factor of 4.
Removed ERFA module¶
The private _erfa module has been converted to its own package PyeERFA. It is now a required
dependency of astropy, and can be directly imported with import
erfa. Importing _erfa from astropy now issues a deprecation
warning and will be removed in the future.
Full change log¶
To see a detailed list of all changes in version v4.2, including changes in API, please see the Full Changelog.
Contributors to the v4.2 release¶
The people who have contributed to the code for this release are:
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