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Cpython v3.15.0b2

Cpython: v3.15.0b2 Release

Release date:
June 2, 2026
Previous version:
v3.15.0b1 (released May 22, 2026)
Magnitude:
15,676 Diff Delta
Contributors:
9 total committers
Data confidence:
Commits:
197 impacting commits

144 Features Released with v3.15.0b2

[3.15] gh-149921: Fix reference leaks in _interpchannels and _interpqueues modules (GH-149922)
#149943
[3.15] gh-150258: Show relative percentage on Tachyon flamegraph (GH-150266)
#150312
[3.15] Skip GNU backtrace test on Arm 32-bit (GH-149493)
#149562
[3.15] Run mypy with four worker processes and uv (GH-149726)
#149773
[3.15] gh-149816: add missing critical section on self in buffered_iternext (GH-150295)
#150305
[3.15] gh-150374: Fix double release of import lock in lazy import reification (GH-150376)
#150378
[3.15] gh-150766: export `_PyGC_VisitFrameStack` and `_PyGC_VisitStackRef` functions (GH-150767)
#150787
[3.15] gh-149738: Fix segmentation fault bug in sqllite3 (GH-149754)
#150768
[3.15] gh-150387: Fix hang in test_run_failed_script_live on slow buildbots (GH-150405)
#150420
[3.15] gh-149534: Fix unification of `defaultdict` and `frozendict` with `|` (GH-149539)
#150709
[3.15] gh-150175: Fix ThreadingMock call_count race condition (GH-150176)
#150182
[3.15] gh-145176: Update CODEOWNERS for Emscripten migration to Platforms directory (GH-149544)
#149550
gh-149707: Fix compiler warning in _ctypes_test on strchr()
#149791
[3.15] Update `SOURCE_URI` for `3.15` branch
#150783
[3.15] gh-149496: Fix MacOSTest.test_default regression when BROWSER env var is set (GH-149579)
#149745
[3.15] gh-149977: Fix extra output of `-m test test_lazy_import` (GH-149978)
#150016
[3.15] gh-149046: fix: correctly handle `str` subclasses in `io.StringIO` (GH-149047)
#150706
[3.15] gh-139489: Add is_valid_text to xml.__all__ (GH-149641)
#149652
[3.15] gh-149983: Fix PyErr_NoMemory call without GIL in winconsoleio.c (GH-149984)
#150113
[3.15] gh-149083: Convert `_initial_missing` for pure py `reduce` to `sentinel` (GH-149536)
#149592
[3.15] gh-149953: Fix null pointer dereference order in `code_objects.c` (GH-149956)
#149976
[3.15] gh-150034: Print JSONL filename when profiling finishes (GH-150035)
#150151
[3.15] PEP 810 - Update some error strings (GH-150126)
#150135
[3.15] Silence experimental coroutine deprecation warnings (GH-150788)
#150794
[3.15] gh-149219: Test `frozendict` in `Lib/test/test_crossinterp.py` (GH-149220)
#150186
[3.15] gh-149619: Fix `_remote_debugging` permissions error on Linux (GH-150012)
#150339
[3.15] gh-150443: Exclude explicit dup3 and pipe2 checks on iOS builds. (GH-150444)
#150446
[3.15] Add Diego as author of PEP 831 (GH-149551)
#149561
[3.15] docs: Clarify docs for error case of `PyDict_GetItemRef` (GH-149506)
#149546
[3.15] Fix minor typos in unicode.rst (GH-149587)
#149620

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Top Contributors in v3.15.0b2

miss-islington
colesbury
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savannahostrowski
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