[RELEASE] Python 3.12.0 beta 1 released.

[Thomas Wouters]

I'm pleased to announce the release of Python 3.12 beta 1 (and feature
freeze for Python 3.12).

https://www.python.org/downloads/release/python-3120b1/
This is a beta preview of Python 3.12

Python 3.12 is still in development. This release, 3.12.0b1, is the first
of four planned beta release previews of 3.12.

Beta release previews are intended to give the wider community the
opportunity to test new features and bug fixes and to prepare their
projects to support the new feature release.

We strongly encourage maintainers of third-party Python projects to test
with 3.12 during the beta phase and report issues found to [the Python bug
tracker (Issues · python/cpython · GitHub) as soon as possible. While the
release is planned to be feature complete entering the beta phase, it is
possible that features may be modified or, in rare cases, deleted up until
the start of the release candidate phase (Monday, 2023-07-31). Our goal is
to have no ABI changes after beta 4 and as few code changes as possible
after 3.12.0rc1, the first release candidate. To achieve that, it will be
extremely important to get as much exposure for 3.12 as possible during the
beta phase.

Please keep in mind that this is a preview release and its use is not
recommended for production environments.


Major new features of the 3.12 series, compared to 3.11

Some of the new major new features and changes in Python 3.12 are:


   - New type annotation syntax for generic classes (PEP 695
   <https://peps.python.org/pep-0695/>).
   - More flexible f-string parsing, allowing many things previously
   disallowed (PEP 701 <https://peps.python.org/pep-0701/>).
   - Even more improved error messages. More exceptions potentially caused
   by typos now make suggestions to the user.
   - Many large and small performance improvements (like PEP 709
   <https://peps.python.org/pep-0709/>).
   - Support for the Linux perf profiler to report Python function names in
   traces.
   - The deprecated wstr and wstr_length members of the C implementation of
   unicode objects were removed, per PEP 623
   <https://peps.python.org/pep-0623/>.
   - In the unittest module, a number of long deprecated methods and
   classes were removed. (They had been deprecated since Python 3.1 or 3.2).
   - The deprecated smtpd and distutils modules have been removed (see PEP
   594 <https://peps.python.org/pep-0594/> and PEP 632
   <https://peps.python.org/pep-0632/>. The setuptools package (installed
   by default in virtualenvs and many other places) continues to provide the
   distutils module.
   - A number of other old, broken and deprecated functions, classes and
   methods have been removed.
   - Invalid backslash escape sequences in strings now warn with
   SyntaxWarning instead of DeprecationWarning, making them more visible.
   (They will become syntax errors in the future.)
   - The internal representation of integers has changed in preparation for
   performance enhancements. (This should not affect most users as it is an
   internal detail, but it may cause problems for Cython-generated code.)
   - (Hey, fellow core developer, if a feature you find important is
   missing from this list, let Thomas know <thomas at python.org>.)

For more details on the changes to Python 3.12, see What’s new in Python
3.12 <https://docs.python.org/dev/whatsnew/3.12.html>. The next pre-release
of Python 3.12 will be 3.12.0b2, currently scheduled for 2023-05-29.


More resources

Online Documentation <https://docs.python.org/3.12/>.
PEP 693 <https://www.python.org/dev/peps/pep-0693/>, the Python 3.12
Release Schedule.
Report bugs via GitHub Issues <https://github.com/python/cpython/issues>.
Help fund Python and its community <https://www.python.org/psf/donations/>.


And now for something completely different

As the first beta release marks the point at which we fork off the release
branch from the main development branch, here’s a poem about forks in the
road.

Two roads diverged in a yellow wood,
And sorry I could not travel both
And be one traveler, long I stood
And looked down one as far as I could
To where it bent in the undergrowth;

Then took the other, as just as fair,
And having perhaps the better claim,
Because it was grassy and wanted wear;
Though as for that the passing there
Had worn them really about the same,

And both that morning equally lay
In leaves, no step had trodden black.
Oh, I kept the first for another day!
Yet knowing how way leads on to way,
I doubted if I should ever come back.

I shall be telling this with a sigh
Somewhere ages and ages hence:
Two roads diverged in a wood, and I —
I took the one less traveled by,
And that has made all the difference.


*The Road Not Taken*, by Robert Frost.

Enjoy the new release

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.

Your release team,
Thomas Wouters
Ned Deily
Steve Dower
-- 
Thomas Wouters <thomas at python.org>