Author: Thomas Wouters
Source
I’m pleased to announce the release of Python 3.12 release candidate 1.
https://www.python.org/downloads/release/python-3120rc1/
This is the first release candidate of Python 3.12.0
This release, 3.12.0rc1, is the penultimate release
preview. Entering the release candidate phase, only reviewed code
changes which are clear bug fixes are allowed between this release
candidate and the final release. The second candidate (and the last
planned release preview) is scheduled for Monday, 2023-09-04, while the
official release of 3.12.0 is scheduled for Monday, 2023-10-02.
There will be no ABI changes from this point forward in the 3.12 series, and the goal is that there will be as few code changes as possible.
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
3.12.0rc1 will work with future versions of Python 3.12. As always,
report any issues to the Python bug tracker.
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?
- 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, allowing many things previously disallowed (PEP 701).
- Support for the buffer protocol in Python code (PEP 688).
- A new debugging/profiling API (PEP 669).
- Support for isolated subinterpreters with separate Global Interpreter Locks (PEP 684).
- Even more improved error messages. More exceptions potentially caused by typos now make suggestions to the user.
- Support for the Linux
perf
profiler to report Python function names in traces. - Many large and small performance improvements (like PEP 709), delivering an estimated 5% overall performance improvementcitation needed.
Type annotations
- New type annotation syntax for generic classes (PEP 695).
- New override decorator for methods (PEP 698).
Deprecations
- The deprecated
wstr
andwstr_length
members of the C implementation of unicode objects were removed, per PEP 623. - 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
anddistutils
modules have been removed (see PEP 594 and PEP 632. Thesetuptools
package continues to provide thedistutils
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 ofDeprecationWarning
, 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.)
For more details on the changes to Python 3.12, see What’s new in Python 3.12. The next pre-release of Python 3.12 will be 3.12.0rc2, the final release candidate, currently scheduled for 2023-09-04.
More resources
- Online Documentation.
- PEP 693, the Python 3.12 Release Schedule.
- Report bugs via GitHub Issues.
- Help fund Python and its community.
Enjoy the new release
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.