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Cpython 3.9

Cpython: 3.9 Release

Release date:
October 31, 2025
Previous version:
v3.8.20 (released September 6, 2024)
Magnitude:
256,434 Diff Delta
Contributors:
555 total committers
Data confidence:
Commits:
4,897 impacting commits

422 Features Released with 3.9

bpo-38341: Add SMTPNotSupportedError in the exports of smtplib
#16525
[3.9] bpo-44659: Replace @ilevkivskyi with @Fidget-Spinner as typing code owner (GH-27210)
#27213
[3.9] Trivial typo in docstring
#27505
[3.9] Update Sphinx bpo role to use redirect URI.
#91891
[3.9] build(deps): bump actions/cache from 3.0.1 to 3.0.2 (GH-92111)
#92125
[3.9] Correct CVE-2020-10735 documentation (GH-100306).
#100697
Change 'exception happened' to 'exception occurred' in two places
#19767
Fix typo found by Min ho Kim
#14879
Fix inconsequential typo in math.remainder algorithm comments.
#14746
Fix compiler warning in new code.
#14690
Fix typo in dictobject comment
#15814
Remove a dead comment from ossaudiodev.c
#15346
Reorder entries in Misc/ACKS
#17663
[3.9] Add source for character mappings (GH-82927)
#92388
Bump version in AppVeyor config
#13822
[3.8] Fix documentation build by pinning Alabaster version to 0.7.13 (GH-113815)
#113899
[3.9] bpo-44472: Fix ltrace functionality when exceptions are raised (GH-26822)
#26831
[3.9] bpo-45401: Change shouldRollover() methods to only rollover regular fโ€ฆ (GH-28822)
#28866
[3.9] gh-97032: avoid test_squeezer crash on macOS buildbots (GH-115508)
#115655
[3.9] gh-114572: Fix locking in cert_store_stats and get_ca_certs
#118109
[3.9] gh-67693: Fix urlunparse() and urlunsplit() for URIs with path starting with multiple slashes and no authority (GH-113563)
#119027
[3.9] gh-122133: Authenticate socket connection for `socket.socketpair()` fallback (GH-122134)
#122428
[3.9] gh-123067: Fix quadratic complexity in parsing "-quoted cookie values with backslashes (GH-123075)
#123107
[3.9] gh-123270: Replaced SanitizedNames with a more surgical fix. (GH-123354)
#123432
[3.9] gh-123678: Upgrade libexpat 2.6.3
#123711
[3.9] gh-112275: Fix HEAD_LOCK deadlock in child process after fork (GH-112336)
#123688
[3.9] gh-119690: Fixes buffer type confusion in _winapi.CreateFile and _winapi.CreateNamedPipe audit events (GH-119735)
#123679
[3.9] gh-121285: Remove backtracking when parsing tarfile headers (GH-121286)
#123641
[3.9] gh-107902: gh-108948: Don't test setting suid/sgid/sticky on systems that don't support them (GH-108368) (GH-109697)
#125576
bpo-39868: Update Language Reference for PEP 572.
#18793

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Top Contributors in 3.9

vstinner
miss-islington
serhiy-storchaka
pablogsal
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lysnikolaou
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