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Cpython v3.12.0b1

Cpython: v3.12.0b1 Release

Release date:
October 31, 2025
Previous version:
v3.12.0a7 (released August 22, 2023)
Magnitude:
65,238 Diff Delta
Contributors:
181 total committers
Data confidence:
Commits:
640 impacting commits

415 Features Released with v3.12.0b1

gh-60436: fix curses textbox backspace/del
#103783
gh-103848: Adds checks to ensure that bracketed hosts found by urlsplit are of IPv6 or IPvFuture format
#103849
gh-104050: Add type hints to Argument Clinic converter keywords
#104588
GH-103092: port `_asyncio` freelist to module state
#104196
gh-103333: Pickle the keyword attributes of AttributeError
#103352
gh-103091: Add PyUnstable_Type_AssignVersionTag
#103095
gh-100370: fix OverflowError in sqlite3.Connection.blobopen for 32-bit builds
#103902
GH-103944: Remove last use of `utcfromtimestamp`
#103995
GH-104510: Fix refleaks in _io base types
#104516
gh-104050: Add more type annotations to Argument Clinic
#104628
gh-104600: Make type.__type_params__ writable
#104634
Replace Netlify with Read the Docs build previews
#103843
gh-64595: Fix write file logic in Argument Clinic
#104507
gh-101819: Fix _io clinic input for unused base class method stubs
#104418
gh-104146: Purge dead code from Argument Clinic
#104680
gh-103225: Fixed zero lineno issue for pdb
#103265
gh-103780: Use patch instead of mock in asyncio unix events test
#103782
gh-83004: Harden winsound init
#103385
typing: Use PEP 695 syntax in typing.py
#104553
gh-103673: Add missing ForkingUnixStreamServer and ForkingUnixDatagramServer socketservers
#103674
Docs build: Add upper bounds to transitive dependencies
#103860
gh-91896: Improve visibility of `ByteString` deprecation warnings
#104294
gh-104050: Add more type annotations to Argument Clinic
#104631
gh-102856: Allow comments inside multi-line f-string expresions
#104006
gh-74690: typing: Call `_get_protocol_attrs` and `_callable_members_only` at protocol class creation time, not during `isinstance()` checks
#103160
gh-95299: Rework test_cppext.py to not invoke setup.py directly
#103316
gh-103607: Fixing pause_reading called in connection made is ignored
#17425
gh-103092: Isolate msvcrt
#103248
gh-69152: Add _proxy_response_headers attribute to HTTPConnection
#26152
gh-82054: allow test runner to split test_asyncio to execute in parallel by sharding.
#103927

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Top Contributors in v3.12.0b1

erlend-aasland
markshannon
carljm
ericsnowcurrently
brandtbucher
pablogsal
encukou
warsaw
serhiy-storchaka
JelleZijlstra

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