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Python 3.9.12

Release Date: March 23, 2022

This is the twelfth maintenance release of Python 3.9

Note: The release you're looking at is Python 3.9.12, a bugfix release for the legacy 3.9 series. Python 3.11 is now the latest feature release series of Python 3. Get the latest release of 3.11.x here.

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. There are only 12 other bugfixes on top of 3.9.11 in this release.

Major new features of the 3.9 series, compared to 3.8

Some of the new major new features and changes in Python 3.9 are:

  • PEP 573, Module State Access from C Extension Methods
  • PEP 584, Union Operators in dict
  • PEP 585, Type Hinting Generics In Standard Collections
  • PEP 593, Flexible function and variable annotations
  • PEP 602, Python adopts a stable annual release cadence
  • PEP 614, Relaxing Grammar Restrictions On Decorators
  • PEP 615, Support for the IANA Time Zone Database in the Standard Library
  • PEP 616, String methods to remove prefixes and suffixes
  • PEP 617, New PEG parser for CPython
  • BPO 38379, garbage collection does not block on resurrected objects;
  • BPO 38692, os.pidfd_open added that allows process management without races and signals;
  • BPO 39926, Unicode support updated to version 13.0.0;
  • BPO 1635741, when Python is initialized multiple times in the same process, it does not leak memory anymore;
  • A number of Python builtins (range, tuple, set, frozenset, list, dict) are now sped up using PEP 590 vectorcall;
  • 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 standard library modules (audioop, ast, grp, _hashlib, pwd, _posixsubprocess, random, select, struct, termios, zlib) are now using the stable ABI defined by PEP 384.

You can find a more comprehensive list in this release's "What's New" document.

More resources

And Now for Something Completely Different

Number 3... THE LARCH.

Full Changelog


Version Operating System Description MD5 Sum File Size GPG
Gzipped source tarball Source release abc7f7f83ea8614800b73c45cf3262d3 25.1 MB SIG
XZ compressed source tarball Source release 4b5fda03e3fbfceca833c997d501bcca 18.8 MB SIG
macOS 64-bit Intel-only installer macOS for macOS 10.9 and later, deprecated d9a46473d41474b05b02ab4d42d6e2f1 29.5 MB SIG
macOS 64-bit universal2 installer macOS for macOS 10.9 and later e0144bd213485290adc05b57e09436eb 37.0 MB SIG
Windows installer (64-bit) Windows Recommended cc816f1323d591087b70df5fc977feae 27.8 MB SIG
Windows installer (32-bit) Windows 1e8477792ec093c02991bd37b8615a2e 26.7 MB SIG
Windows help file Windows a7cd250b2b561049e2e814c1668cb44d 8.5 MB SIG
Windows embeddable package (64-bit) Windows 5b16e3ca71cc29ab71a6e4b92a2f3f13 8.1 MB SIG
Windows embeddable package (32-bit) Windows 94955cca54dd7d21bedc4d10ab9d2d81 7.3 MB SIG