Python 3.9.0 is almost ready. This release, 3.9.0rc2, is the last planned
preview before the final release of Python 3.9.0 on 2020-10-05. Get it here:
https://www.python.org/downloads/release/python-390rc2/
<https://www.python.org/downloads/release/python-390rc2/>
In the mean time, we strongly encourage maintainers of third-party Python
projects to prepare their projects for 3.9 compatibility during this phase. As
always, report any issues to the Python bug tracker <https://bugs.python.org/>.
Please keep in mind that this is a preview release and its use is not
recommended for production environments.
Information for core developers
The 3.9 branch is now accepting changes for 3.9.1. To maximize stability, the
final release will be cut from the v3.9.0rc2 tag. If you need the release
manager to cherry-pick any critical fixes, mark issues as release blockers
and/or add him as a reviewer on a critical backport PR on GitHub.
To see which changes are currently cherry-picked for inclusion in 3.9.0, look
at the short-lived branch-v3.9.0
<https://github.com/python/cpython/tree/branch-v3.9.0> on GitHub.
Installer news
This is the first version of Python to default to the 64-bit installer on
Windows. The installer now also actively disallows installation on Windows 7.
Python 3.9 is incompatible with this unsupported version of Windows.
Major new features of the 3.9 series, compared to 3.8
Some of the new major new features and changes in Python 3.9 are:
PEP 584 <https://www.python.org/dev/peps/pep-0584/>, Union Operators in dict
PEP 585 <https://www.python.org/dev/peps/pep-0585/>, Type Hinting Generics In
Standard Collections
PEP 593 <https://www.python.org/dev/peps/pep-0593/>, Flexible function and
variable annotations
PEP 602 <https://www.python.org/dev/peps/pep-0602/>, Python adopts a stable
annual release cadence
PEP 615 <https://www.python.org/dev/peps/pep-0615/>, Support for the IANA Time
Zone Database in the Standard Library
PEP 616 <https://www.python.org/dev/peps/pep-0616/>, String methods to remove
prefixes and suffixes
PEP 617 <https://www.python.org/dev/peps/pep-0617/>, New PEG parser for CPython
BPO 38379 <https://bugs.python.org/issue38379>, garbage collection does not
block on resurrected objects;
BPO 38692 <https://bugs.python.org/issue38692>, os.pidfd_open added that allows
process management without races and signals;
BPO 39926 <https://bugs.python.org/issue39926>, Unicode support updated to
version 13.0.0;
BPO 1635741 <https://bugs.python.org/issue1635741>, when Python is initialized
multiple times in the same process, it does not leak memory anymore;
A number of Python builtins (range, tuple, set, frozenset, list, dict) are now
sped up using PEP 590 <https://www.python.org/dev/peps/pep-0590> vectorcall;
A number of Python modules (_abc, audioop, _bz2, _codecs, _contextvars, _crypt,
_functools, _json, _locale, operator, resource, time, _weakref) now use
multiphase initialization as defined by PEP 489
<https://www.python.org/dev/peps/pep-0489/>;
A number of standard library modules (audioop, ast, grp, _hashlib, pwd,
_posixsubprocess, random, select, struct, termios, zlib) are now using the
stable ABI defined by PEP 384 <https://www.python.org/dev/peps/pep-0384/>.
More resources
Online Documentation <https://docs.python.org/3.9/>
PEP 596 <https://www.python.org/dev/peps/pep-0596/>, 3.9 Release Schedule
Report bugs at https://bugs.python.org <https://bugs.python.org/>.
Help fund Python and its community <https://www.python.org/psf/donations/>.
Your friendly release team,
Ned Deily @nad <https://discuss.python.org/u/nad>
Steve Dower @steve.dower <https://discuss.python.org/u/steve.dower>
Łukasz Langa @ambv <https://discuss.python.org/u/ambv>
_______________________________________________
python-committers mailing list -- python-committers@python.org
To unsubscribe send an email to python-committers-le...@python.org
https://mail.python.org/mailman3/lists/python-committers.python.org/
Message archived at
https://mail.python.org/archives/list/python-committers@python.org/message/72MT4F4BXHZOVJB35LFW74GGIU74YGIW/
Code of Conduct: https://www.python.org/psf/codeofconduct/
