Article <mailman.41.1725719183.2917.python-list@python.org>

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From: =?utf-8?Q?=C5=81ukasz_Langa?= <lukasz@langa.pl>
Newsgroups: comp.lang.python
Subject: [RELEASE] Python 3.13.0RC2, 3.12.6, 3.11.10, 3.10.15, 3.9.20, and
 3.8.20 are now available!
Date: Sat, 7 Sep 2024 16:26:06 +0200
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Hi there!
A big joint release today. Mostly security fixes but we also have the =
final release candidate of 3.13 so let=E2=80=99s start with that!
Python 3.13.0RC2

Final opportunity to test and find any show-stopper bugs before we bless =
and release 3.13.0 final on October 1st.

Get it here: Python Release Python 3.13.0rc2 | Python.org =
<https://www.python.org/downloads/release/python-3130rc2/>
Call to action

We strongly encourage maintainers of third-party Python projects to =
prepare their projects for 3.13 compatibilities during this phase, and =
where necessary publish Python 3.13 wheels on PyPI to be ready for the =
final release of 3.13.0. Any binary wheels built against Python =
3.13.0rc2 will work with future versions of Python 3.13. As always, =
report any issues to the Python bug tracker =
<https://github.com/python/cpython/issues>.

Please keep in mind that this is a preview release and while it=E2=80=99s =
as close to the final release as we can get it, its use is =
notrecommended for production environments.

Core developers: time to work on documentation now

Are all your changes properly documented?
Are they mentioned in What=E2=80=99s New =
<https://docs.python.org/3.13/whatsnew/3.13.html>?
Did you notice other changes you know of to have insufficient =
documentation?
As a reminder, until the final release of 3.13.0, the 3.13 branch is set =
up so that the Release Manager (@thomas =
<https://discuss.python.org/u/thomas>) has to merge the changes. Please =
add him (@Yhg1s on GitHub) to any changes you think should go into =
3.13.0. At this point, unless something critical comes up, it should =
really be documentation only. Other changes (including tests) will be =
pushed to 3.13.1.

New features in Python 3.13

A new and improved interactive interpreter =
<https://docs.python.org/3.13/whatsnew/3.13.html#a-better-interactive-inte=
rpreter>, based on PyPy <https://pypy.org/>=E2=80=99s, featuring =
multi-line editing and color support, as well as colorized exception =
tracebacks =
<https://docs.python.org/3.13/whatsnew/3.13.html#improved-error-messages>.=

An experimental=C2=A0free-threaded build mode =
<https://docs.python.org/3.13/whatsnew/3.13.html#free-threaded-cpython>, =
which disables the Global Interpreter Lock, allowing threads to run more =
concurrently. The build mode is available as an experimental feature in =
the Windows and macOS installers as well.
A preliminary,=C2=A0experimental=C2=A0JIT =
<https://docs.python.org/3.13/whatsnew/3.13.html#experimental-jit-compiler=
>, providing the ground work for significant performance improvements.
The locals() builtin function (and its C equivalent) now has =
well-defined semantics when mutating the returned mapping =
<https://docs.python.org/3.13/whatsnew/3.13.html#defined-mutation-semantic=
s-for-locals>, which allows debuggers to operate more consistently.
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