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Cpython v3.15.0a1

Cpython: v3.15.0a1 Release

Release date:
October 14, 2025
Previous version:
v3.14.3 (released February 3, 2026)
Magnitude:
27,178 Diff Delta
Contributors:
26 total committers
Data confidence:
Commits:
674 impacting commits

232 Features Released with v3.15.0a1

[3.14] Link to 3.14 GC design docs
#139387
[3.14] gh-139905: Provide suggestion in error message if `Generic.__init_subclass__` was not called (GH-139943)
#139955
[3.14] gh-96491: Deduplicate version in IDLE shell title (GH-139841)
#139931
[3.14] gh-139894: fix incorrect sharing of current task while forking in `asyncio` (GH-139897)
#139913
[3.14] gh-101100: Document `zlib` public constants to fix reference warnings (GH-139835)
#139910
[3.14] gh-139823: Extend list of optional dependencies in `configure.rst` (GH-139826)
#139887
[3.14] gh-101100: Fix sphinx warnings in `library/smtplib.rst` (GH-139991)
#140084
[3.14] gh-125996: fix thread safety of `collections.OrderedDict` (GH-133734)
#140053
[3.14] gh-82575: Adjust `time.get_clock_info` *adjustable* attribute doc (GH-135920)
#140097
[3.14] gh-97914: Reword misleading sentence on conditional expressions (GH-139064)
#140093
[3.14] gh-139590: Stricter `ruff` rules for `Tools/wasm` (GH-139752)
#139811
[3.14] Using Python on Windows: Free-threaded is supported from 3.14 (GH-139992)
#140045
[3.14] gh-137871: Clarify cmath.nan documentation by linking to math module (GH-137876)
#140095
[3.14] gh-138072: Fix typos and grammatical errors and improve clarity in asyncio howto document (GH-138895)
#140091
[3.14] gh-139843: Document `signal.SIGQUIT` to fix Sphinx references (GH-139844)
#139885
[3.14] gh-140000: Traverse `name` attribute for `TypeVar`, `TypeVarTuple`, `TypeAliasType`, `ParamSpec` (GH-140016)
#140063
[3.14] gh-139842: Clarify `__module__` description in typing.rst (GH-139863)
#139869
[3.14] gh-102247: Improve documentation of http.HTTPStatus members update (GH-133190)
#140089
[3.14] gh-107073: fix relevant typo in `PyObject_ClearManagedDict` (GH-140032)
#140033
[3.14] gh-131189: Remove `curses` mention from `PYTHON_BASIC_REPL` docs (GH-140022)
#140027
[3.14] GH-139809: Fix argparse subcommand prog not respecting color environment variables (GH-139818)
#139866
[3.14] GH-139979: Add @force_not_colorized_test_class to TestOptionalHelpVersionActions (GH-139980)
#140005
[3.14] gh-139672: Remove references to `passlib` (GH-139673)
#139867
[3.14] gh-139845: do not print twice in default asyncio REPL (GH-139846)
#139859
[3.14] gh-116738: test `dbm.gnu` module on FT Python build (GH-138467)
#139987
[3.14] gh-139391: properly handle `signal.signal()` in `UnixConsole` when called from a non-main thread (GH-139392)
#139858
[3.14] gh-127081: add critical sections to `dbm` objects (gh-132749)
#139996
[3.14] gh-139988: fix a leak when failing to create a Union type (GH-139990)
#139993
[3.14] gh-116738: make `mmap` module thread-safe (GH-139237)
#139825
[3.14] GH-129805: Clean up some changes from GH-129806 (GH-133540)
#138972

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Top Contributors in v3.15.0a1

miss-islington
picnixz
jihugo
vstinner
ericsnowcurrently
serhiy-storchaka
markshannon
freakboy3742
brettcannon
JelleZijlstra

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