Was kept for backward compatibility with Python 2.7. When Python 2.7 was still supported, a lot of functionality in Python 3 You should check for DeprecationWarning in your code ¶ PEP 602, CPython adopts an annual release cycle. PEP 615, the IANA Time Zone Database is now present in the standardĪn implementation of a topological sort of a graph is now provided in Select, struct, termios, zlib) are now using Time, _weakref) now use multiphase initialization as definedĪ number of standard library modules ( audioop, ast, grp, _json, _locale, math, operator, resource, _codecs, _contextvars, _crypt, _functools, Garbage collection does not block on resurrected objects Ī number of Python modules ( _abc, audioop, _bz2, PEP 617, CPython now uses a new parser based on PEG Ī number of Python builtins (range, tuple, set, frozenset, list, dict) are

PEP 573, fast access to module state from methods of C extension Os.pidfd_open() added that allows process management without races PEP 593, flexible function and variable annotations PEP 616, string methods to remove prefixes and suffixes. PEP 614, relaxed grammar restrictions on decorators. PEP 585, type hinting generics in standard collections PEP 596 - Python 3.9 Release Schedule Summary – Release highlights ¶

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