A number of Python modules (_abc, audioop, _bz2, _codecs, _contextvars, _crypt, _functools, _json, _locale, operator, resource, time, _weakref) now use multiphase initialization as defined by PEP 489.A number of Python builtins (range, tuple, set, frozenset, list, dict) are now sped up using PEP 590 vectorcall.BPO 1635741, when Python is initialized multiple times in the same process, it does not leak memory anymore.BPO 39926, Unicode support updated to version 13.0.0.BPO 38692, os.pidfd_open added that allows process management without races and signals.BPO 38379, garbage collection does not block on resurrected objects.PEP 616, String methods to remove prefixes and suffixes.PEP 615, Support for the IANA Time Zone Database in the Standard Library.PEP 614, Relaxing Grammar Restrictions On Decorators.PEP 602, Python adopts a stable annual release cadence.PEP 593, Flexible function and variable annotations.PEP 585, Type Hinting Generics In Standard Collections.PEP 573, Module State Access from C Extension Methods.Some of the new major new features and changes in Python 3.9 are: Major new features of the 3.9 series, compared to 3.8 There are only 12 other bugfixes on top of 3.9.11 in this release. This is a special release which fixes a regression introduced by BPO 46968 which caused Python to no longer build on Red Hat Enterprise Linux 6. Python 3.11 is now the latest feature release series of Python 3. Note: The release you're looking at is Python 3.9.12, a bugfix release for the legacy 3.9 series. Release Date: MaThis is the twelfth maintenance release of Python 3.9

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