# Python 3.12.0rc3 released (honestly the final release candidate I swear!) **URL:** \ **Category:** Committers\ **Tags:** release\ **Created:** [September 19, 2023, 11:11am UTC](https://discuss.python.org/t/python-3-12-0rc3-released-honestly-the-final-release-candidate-i-swear/34093 "2023-09-19T11:11:46Z")\ **Posts on this page:** 1\ **Showing post:** 1
**Author:** ![thomas](https://sea2.discourse-cdn.com/flex002/user_avatar/discuss.python.org/thomas/32/5492_2.png) [@thomas](https://discuss.python.org/u/thomas)\ **Post date:** [September 19, 2023, 11:11am UTC](https://discuss.python.org/t/python-3-12-0rc3-released-honestly-the-final-release-candidate-i-swear/34093/1 "2023-09-19T11:11:46Z")
No more bugs please! **Python 3.12.0 rc3 is here**! As a reminder, until the final release of 3.12.0, the 3.12 branch is set up so that the Release Manager (me) has to merge the changes. Please add me (`@Yhg1s` on GitHub) to any changes you think should go into 3.12. At this point, unless something critical comes up, it should really be **documentation only**. Other changes (including tests) will be pushed to 3.12.1. > **[Python Release Python 3.12.0rc3](https://www.python.org/downloads/release/python-3120rc3/)** > > The official home of the Python Programming Language # This is the third release candidate of Python 3.12.0 This release, **3.12.0rc3** , is the absolutely last release preview for Python 3.12. There will be **no ABI changes** from this point forward in the 3.12 series. The intent is for the final release of 3.12.0, scheduled for Monday, 2023-10-02, to be identical to this release candidate. **This really is the last chance to find critical problems in Python 3.12.** ## Call to action We strongly encourage maintainers of third-party Python projects to prepare their projects for 3.12 compatibilities during this phase, and where necessary publish Python 3.12 wheels on PyPI to be ready for the final release of 3.12.0. Any binary wheels built against Python 3.12.0rc3 will work with future versions of Python 3.12. 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’s as close to the final release as we can get it, its use is **not** recommended for production environments. ### Core developers: time to work on documentation now - Are all your changes properly documented? - Are they mentioned in [What’s New](https://docs.python.org/3.12/whatsnew/3.12.html)? - Did you notice other changes you know of to have insufficient documentation? # Major new features of the 3.12 series, compared to 3.11 ## New features - [More flexible f-string parsing](https://docs.python.org/3.12/whatsnew/3.12.html#pep-701-syntactic-formalization-of-f-strings), allowing many things previously disallowed ([PEP 701](https://peps.python.org/pep-0701/)). - [Support for the buffer protocol](https://docs.python.org/3.12/whatsnew/3.12.html#pep-688-making-the-buffer-protocol-accessible-in-python) in Python code ([PEP 688](https://peps.python.org/pep-0688/)). - [A new debugging/profiling API](https://docs.python.org/3.12/whatsnew/3.12.html#pep-669-low-impact-monitoring-for-cpython) ([PEP 669](https://peps.python.org/pep-0669/)). - [Support for isolated subinterpreters](https://docs.python.org/3.12/whatsnew/3.12.html#pep-684-a-per-interpreter-gil) with separate Global Interpreter Locks ([PEP 684](https://peps.python.org/pep-0684)). - [Even more improved error messages](https://docs.python.org/3.12/whatsnew/3.12.html#improved-error-messages). More exceptions potentially caused by typos now make suggestions to the user. - [Support for the Linux `perf` profiler](https://docs.python.org/3.12/howto/perf_profiling.html) to report Python function names in traces. - [Many large and small performance improvements](https://docs.python.org/3.12/whatsnew/3.12.html#optimizations) (like [PEP 709](https://peps.python.org/pep-0709/) and support for the BOLT binary optimizer), delivering an estimated 5% overall performance improvementcitation needed. ## Type annotations - [New type annotation syntax](https://docs.python.org/3.12/whatsnew/3.12.html#pep-695-type-parameter-syntax) for generic classes ([PEP 695](https://peps.python.org/pep-0695/)). - [New override decorator](https://docs.python.org/3.12/whatsnew/3.12.html#pep-698-override-decorator-for-static-typing) for methods ([PEP 698](https://peps.python.org/pep-0698)). ## Deprecations - 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 continues to provide the `distutils` module. - [A number of other old, broken and deprecated functions, classes and methods](https://docs.python.org/3.12/whatsnew/3.12.html#removed) 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](mailto:thomas@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 scheduled release of Python 3.12 will be 3.12.0, the **final release** , currently scheduled for 2023-10-02. # 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/). # 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/). Your release team, Thomas Wouters @thomas Ned Deily @nad Steve Dower @steve.dower Łukasz Langa @ambv --- _[View the full topic](https://discuss.python.org/t/python-3-12-0rc3-released-honestly-the-final-release-candidate-i-swear/34093)._