That is the thirteenth upkeep launch of Python 3.9. Get it right here:
Based on the discharge calendar laid out in PEP 596, Python 3.9.13 is the last
common upkeep launch. Beginning now, the three.9 department will solely
settle for safety fixes and releases of these will probably be made in source-only
type till October 2025.
This can be a milestone second for me because it signifies that now each of my
launch collection are security-only. My work as launch supervisor enters its
last stage. I’m not crying, you’re crying!
In comparison with the three.8 collection, this final common bugfix launch remains to be
fairly energetic at 166 commits since 3.9.12. Compared, model
3.8.10, the ultimate common bugfix launch of Python 3.8, included solely 92
commits. Nonetheless, it’s probably that it was 3.8 that was particular right here
with the governance adjustments occupying core builders’ minds. For
reference, model 3.7.8, the ultimate common bugfix launch of Python
3.7, included 187 commits.
In any case, 166 commits is kind of just a few adjustments, a few of which being fairly vital fixes. Check out the change log for particulars.
A number of the new main new options and adjustments in Python 3.9 are:
- PEP 573, Module State Entry from C Extension Strategies
PEP 584, Union Operators in
- PEP 585, Sort Hinting Generics In Commonplace Collections
- PEP 593, Versatile perform and variable annotations
- PEP 602, Python adopts a steady annual launch cadence
- PEP 614, Stress-free Grammar Restrictions On Decorators
- PEP 615, Assist for the IANA Time Zone Database within the Commonplace Library
- PEP 616, String strategies to take away prefixes and suffixes
- PEP 617, New PEG parser for CPython
- BPO 38379, rubbish assortment doesn’t block on resurrected objects;
- BPO 38692, os.pidfd_open added that enables course of administration with out races and alerts;
- BPO 39926, Unicode help up to date to model 13.0.0;
- BPO 1635741, when Python is initialized a number of occasions in the identical course of, it doesn’t leak reminiscence anymore;
- A lot of Python builtins (vary, tuple, set, frozenset, checklist, dict) are actually sped up utilizing PEP 590 vectorcall;
- A lot of Python modules (_abc, audioop, _bz2, _codecs,
_contextvars, _crypt, _functools, _json, _locale, operator, useful resource,
time, _weakref) now use multiphase initialization as outlined by PEP 489;
- A lot of commonplace library modules (audioop, ast, grp, _hashlib,
pwd, _posixsubprocess, random, choose, struct, termios, zlib) are actually
utilizing the steady ABI outlined by PEP 384.
You’ll find a extra complete checklist on this launch’s “What’s New” doc.
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