![]() ![]() New override decorator for methods ( PEP 698).New type annotation syntax for generic classes ( PEP 695).Many large and small performance improvements (like PEP 709 and support for the BOLT binary optimizer), delivering an estimated 5% overall performance improvement citation needed.Support for the Linux perf profiler to report Python function names in traces.More exceptions potentially caused by typos now make suggestions to the user. Support for isolated subinterpreters with separate Global Interpreter Locks ( PEP 684).A new debugging/profiling API ( PEP 669).Support for the buffer protocol in Python code ( PEP 688).More flexible f-string parsing, allowing many things previously disallowed ( PEP 701).Major new features of the 3.12 series, compared to 3.11 New features Did you notice other changes you know of to have insufficient documentation?.Are all your changes properly documented?.Core developers: time to work on documentation now 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. As always, report any issues to the Python bug tracker. Any binary wheels built against Python 3.12.0rc3 will work with future versions of Python 3.12. 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. This really is the last chance to find critical problems in Python 3.12. The intent is for the final release of 3.12.0, scheduled for Monday,, to be identical to this release candidate. There will be no ABI changes from this point forward in the 3.12 series. This release, 3.12.0rc3, is the absolutely last release preview for Python 3.12. 19, 2023 This is the third release candidate of Python 3.12.0 ![]()
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