[RELEASE] Python 3.12.0 beta 1 released.
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
participants (1)
-
Thomas Wouters