python39: added version 3.9.0
3.9.0 Release highlights
New syntax features:
PEP 584, union operators added to dict;
PEP 585, type hinting generics in standard collections;
PEP 614, relaxed grammar restrictions on decorators.
New built-in features:
PEP 616, string methods to remove prefixes and suffixes.
New features in the standard library:
PEP 593, flexible function and variable annotations;
os.pidfd_open() added that allows process management without races and signals.
Interpreter improvements:
PEP 573, fast access to module state from methods of C extension types;
PEP 617, CPython now uses a new parser based on PEG;
a number of Python builtins (range, tuple, set, frozenset, list, dict) are now sped up using PEP 590 vectorcall;
garbage collection does not block on resurrected objects;
a number of Python modules (_abc, audioop, _bz2, _codecs, _contextvars, _crypt, _functools, _json, _locale, math, operator, resource, time, _weakref) now use multiphase initialization as defined by PEP 489;
a number of standard library modules (audioop, ast, grp, _hashlib, pwd, _posixsubprocess, random, select, struct, termios, zlib) are now using the stable ABI defined by PEP 384.
New library modules:
PEP 615, the IANA Time Zone Database is now present in the standard library in the zoneinfo module;
an implementation of a topological sort of a graph is now provided in the new graphlib module.
Release process changes:
PEP 602, CPython adopts an annual release cycle.
2020-10-10 22:19:47 +02:00
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HTML Documentation for Python 3.8
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