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Cpython v3.15.0b1

Cpython: v3.15.0b1 Release

Release date:
May 7, 2026
Previous version:
v3.15.0a8 (released April 7, 2026)
Magnitude:
66,082 Diff Delta
Contributors:
98 total committers
Data confidence:
Commits:
320 impacting commits

281 Features Released with v3.15.0b1

[3.13] gh-148370: prevent quadratic behavior in `configparser.ParsingError.combine` (GH-148452)
#148533
Un-skip previously-broken `test_get_type_hints_modules_forwardref`
#149048
gh-131798: do not watch immutable types in JIT
#148383
gh-146553: Fix infinite loop in typing.get_type_hints() on circular __wrapped__
#148595
gh-146063: Add PyObject_CallFinalizerFromDealloc() to the limited C API
#146172
gh-148675: Optimize arraydescr structure: use char[3]
#149455
[3.13] gh-148093: Raise binascii.Error from binascii.a2b_uu() on empty input (GH-149077)
#149349
gh-146462: add dict introspection debug offsets
#148633
Speed up counting in statistics.fmean()
#148875
[3.14] gh-137335: remove a mktemp use in multiprocessing.connection to avoid security scanner noise (GH-148578)
#148583
gh-148989: `_remote_debugging`: Remove dead code, unnecessary gc state read
#148990
GH-146475: Block Apple Clang for building JIT stencils
#149188
gh-148907: fix performance regression in `PyType_GetModuleByDef` on free-threading
#148908
gh-148600: Add Modules/_ssl_data_40.h data
#148601
[3.14] gh-149122: Fix refleak in codegen (GH-149179)
#149181
gh-149173: Fix inverted PYTHON_BASIC_REPL environment check in _pyrepl_available()
#149174
gh-108411: Make typing.IO/BinaryIO arguments positional-only
#142906
[3.13] gh-121946: Use clang-20 for TSan build (GH-148570)
#148754
[3.14] gh-132631: Fix "I/O operation on closed file" when parsing JSON Lines file (GH-132632)
#148921
gh-148829: bump number of static types
#149121
gh-148718: Fix Py_STACKREF_DEBUG build by defining macros
#148719
[3.14] gh-149148: Upgrade bundled pip to 26.1 (GH-149150)
#149154
GH-130750: Restore quoting of choices in argparse error messages to match documentation and improve clarity
#144983
Replace deprecated action with RtD app
#149111
gh-149254: Bump OpenSSL versions for iOS and Android.
#149270
gh-148600: Add OpenSSL 4.0.0 support to test configurations
#149356
gh-149202: Don't use -fno-omit-frame-pointer on ppc64le
#149485
gh-148688: Fix _BlocksOutputBuffer_Finish() double free
#148689
gh-144319: `madvise(MADV_HUGEPAGE)`
#144353
GH-145278: freeze encodings (partially) and linecache
#148347

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Top Contributors in v3.15.0b1

NekoAsakura
markshannon
kumaraditya303
eendebakpt
pablogsal
encukou
jihugo
serhiy-storchaka
sergey-miryanov
diegorusso

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