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Cpython v3.15.0b3

Cpython: v3.15.0b3 Release

Release date:
June 23, 2026
Previous version:
v3.15.0b2 (released June 2, 2026)
Magnitude:
3,788 Diff Delta
Contributors:
8 total committers
Data confidence:
Commits:
191 impacting commits

104 Features Released with v3.15.0b3

[3.15] gh-150662: Stop unbounded memory growth in Tachyon `--gecko` collector (GH-150845)
#151000
[3.15] gh-151218: Replace sys.flags in PyConfig_Set() (GH-151402)
#151552
[3.15] gh-149321: Remove lazy_imports=none startup mode (GH-149389)
#150129
[3.15] gh-143988: Fix re-entrant mutation crashes in socket sendmsg/recvmsg_into (GH-143987)
#151246
[3.15] gh-151039: Fix a crash when `_datetime` types outlive `_datetime` module (GH-151044)
#151143
[3.15] gh-101267: ProcessPoolExecutor no longer shares 1 BrokenProcessPool exception among all failed futures (GH-101268)
#151430
gh-151253: Dump the Python path configuration on _PyCodec_InitRegistry() failure
#151250
[3.15] gh-151510: Fix __lazy_import__ without frame (GH-151511)
#151610
[3.15] gh-138991: Update dataclass documentation for new eq behavior in Python 3.13 (GH-139007)
#151372
[3.15] gh-151496: Use process groups in test_dtrace (GH-151512)
#151589
[3.15] gh-151436: Fix missing `tstate->last_profiled_frame` updates (GH-151437)
#151612
[3.15] gh-151278: Fix test_faulthandler on UBSan (GH-151279)
#151281
[3.15] gh-149671: Restore compatibility with setuptools -nspkg.pth files in site module (GH-151319)
#151489
[3.15] gh-151678: Add tests for tkinter widget virtual events (GH-151793)
#151805
[3.15] gh-150723: Fix perf jitdump files on macOS (GH-150728)
#150832
[3.15] gh-150319: Replace all documentation which says "See PEP 585" (GH-150325)
#150808
[3.15] gh-150700: Fix class-scope inline comprehensions when nested scopes reference `__class__` and friends (GH-150735)
#151211
[3.15] gh-143008: Fix race re-initializing TextIOWrapper
#151203
[3.15] gh-141510 Document and test frozendict class matching behaviour (GH-150799)
#151701
[3.15] gh-132467: Document and test that generic aliases are not classes (GH-133504)
#150854
[3.15] gh-151223: fix tsan data races in load global specializations (GH-151393)
#151513
[3.15] gh-151770: Fix `datetime.fromisoformat()` on an out-of-range month w/ a 24:00 time (GH-151771)
#151809
gh-151546: Fix stack limits on musl
#151548
[3.15] gh-150966: Fix live profiling error tests (GH-151020)
#151604
[3.15] gh-148932: Fix `profiling.sampling` on Windows virtual environments (GH-150541)
#151097
[3.15] gh-151228: fix data race on clearing embedded dict values (GH-151330)
#151359
[3.15] gh-151584: Remove `PyUnstable_Module_SetGIL` call in `_remote_debugging` (GH-151585)
#151603
[3.15] gh-141510 Add frozendict fast paths to abstract.c (GH-150692)
#151704
[3.15] gh-150436: Skip subprocess test on STATUS_DLL_INIT_FAILED (GH-150704)
#150713
[3.15] gh-151019: Fix test_os on 32-bit FreeBSD (GH-151087)
#151093

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Top Contributors in v3.15.0b3

miss-islington
pablogsal
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