The deprecated wstr and wstr_length members of the C implementation of unicode objects were removed, per PEP 623.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), 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 3.12.0rc1 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. 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. The second candidate (and the last planned release preview) is scheduled for Monday,, while the official release of 3.12.0 is scheduled for Monday. Entering the release candidate phase, only reviewed code changes which are clear bug fixes are allowed between this release candidate and the final release. This release, 3.12.0rc1, is the penultimate release preview. 6, 2023 This is the first release candidate of Python 3.12.0
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