From Newsgroup: comp.lang.python.announce

After all the shenanigans two weeks ago – everyone discovering nasty little problems in release candidate 2 – the last week was suspiciously quiet, and therefore I can finally say: <https://discuss.python.org/t/python-3-13-0-final-has-been-released/66972#p-196505-python-3130-is-now-available-1>Python
3.13.0 is now available

https://www.python.org/downloads/release/python-3130/
This is the stable release of Python 3.13.0

Python 3.13.0 is the newest major release of the Python programming
language, and it contains many new features and optimizations compared to Python 3.12. (Compared to the last release candidate, 3.13.0rc3, 3.13.0 contains two small bug fixes and some documentation and testing changes.) <https://discuss.python.org/t/python-3-13-0-final-has-been-released/66972#p-196505-major-new-features-of-the-313-series-compared-to-312-3>Major
new features of the 3.13 series, compared to 3.12

Some of the new major new features and changes in Python 3.13 are: <https://discuss.python.org/t/python-3-13-0-final-has-been-released/66972#p-196505-new-features-4>New
features

- A new and improved interactive interpreter
<https://docs.python.org/3.13/whatsnew/3.13.html#a-better-interactive-interpreter>,
based on PyPy <https://pypy.org/>’s, 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* free-threaded build mode
<https://docs.python.org/3.13/whatsnew/3.13.html#whatsnew313-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, *experimental* JIT
<https://docs.python.org/3.13/whatsnew/3.13.html#an-experimental-just-in-time-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-semantics-for-locals>,
which allows debuggers to operate more consistently.
- A modified version of mimalloc <https://github.com/microsoft/mimalloc>is
now included, optional but enabled by default if supported by the platform,
and required for the free-threaded build mode.
- Docstrings now have their leading indentation stripped
<https://docs.python.org/3.13/whatsnew/3.13.html#other-language-changes>,
reducing memory use and the size of .pyc files. (Most tools handling
docstrings already strip leading indentation.)
- The dbm module <https://docs.python.org/3.13/library/dbm.html> has a
new dbm.sqlite3 backend
<https://docs.python.org/3.13/whatsnew/3.13.html#dbm> that is used by
default when creating new files.
- The minimum supported macOS version was changed from 10.9 to 10.13
(High Sierra). Older macOS versions will not be supported going forward.
- WASI is now a Tier 2 supported platform
<https://peps.python.org/pep-0011/#tier-2>. Emscripten is no longer
an officially
supported platform
<https://peps.python.org/pep-0011/#no-longer-supported-platforms> (but
Pyodide <https://pyodide.org/> continues to support Emscripten).
- iOS is now a Tier 3 supported platform
<https://peps.python.org/pep-0730/>.
- Android is now a Tier 3 supported platform
<https://peps.python.org/pep-0738/>.

<https://discuss.python.org/t/python-3-13-0-final-has-been-released/66972#p-196505-typing-5>
Typing

- Support for type defaults in type parameters
<https://peps.python.org/pep-0696/>.
- A new type narrowing annotation <https://peps.python.org/pep-0742/>,
typing.TypeIs.
- A new annotation for read-only items in TypeDicts
<https://peps.python.org/pep-0705/>.
- A new annotation for marking deprecations in the type system
<https://peps.python.org/pep-0702>.

<https://discuss.python.org/t/python-3-13-0-final-has-been-released/66972#p-196505-removals-and-new-deprecations-6>Removals
and new deprecations

- PEP 594 (Removing dead batteries from the standard library)
<https://peps.python.org/pep-0594/> scheduled removals of many
deprecated modules: aifc, audioop, chunk, cgi, cgitb, crypt, imghdr,
mailcap, msilib, nis, nntplib, ossaudiodev, pipes, sndhdr, spwd, sunau,
telnetlib, uu, xdrlib, lib2to3.
- Many other removals
<https://docs.python.org/3.13/whatsnew/3.13.html#removed-modules-and-apis> of
deprecated classes, functions and methods in various standard library
modules.
- C API removals
<https://docs.python.org/3.13/whatsnew/3.13.html#removed-c-apis> and
deprecations
<https://docs.python.org/3.13/whatsnew/3.13.html#deprecated-c-apis>.
(Some removals present in alpha 1 were reverted in alpha 2, as the removals
were deemed too disruptive at this time.)
- New deprecations
<https://docs.python.org/3.13/whatsnew/3.13.html#new-deprecations>, most
of which are scheduled for removal from Python 3.15 or 3.16.

For more details on the changes to Python 3.13, see What’s new in Python
3.13 <https://docs.python.org/3.13/whatsnew/3.13.html>. <https://discuss.python.org/t/python-3-13-0-final-has-been-released/66972#p-196505-more-resources-7>More
resources

- Online Documentation <https://docs.python.org/3.13/>
- PEP 719 <https://peps.python.org/pep-0719/>, 3.13 Release Schedule
- Report bugs at Issues · python/cpython · GitHub
<https://github.com/python/cpython/issues>.
- Help fund Python directly
<https://www.python.org/psf/donations/python-dev/> (or via GitHub
Sponsors <https://github.com/sponsors/python>), and support the Python
community <https://www.python.org/psf/donations/>.

<https://discuss.python.org/t/python-3-13-0-final-has-been-released/66972#p-196505-we-hope-you-enjoy-the-new-releases-8>We
hope you enjoy the new releases!

Thanks to all of the many volunteers who help make Python Development and
these releases possible! Please consider supporting our efforts by
volunteering yourself or through organization contributions to the Python Software Foundation <https://www.python.org/psf-landing/>.

Choo-choo from the release train,

Your release team,
Thomas Wouters
Ned Deily
Steve Dower
Łukasz Langa
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