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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

gh-149504: Fix re-entrancy bug when .pth/.start file invokes site.addsitedir()
#149659
[3.15] gh-150285: Fix too long docstrings in the curses module (GH-150286)
#150331
[3.15] gh-150228: Improve the PEP 829 batch processing APIs (GH-150542)
#150748
[3.15] gh-149584: Fix excessive overhead in the Tachyon profiler regarding the cache behavior (GH-149649)
#150152
[3.15] gh-150285: Fix too long docstrings in the io module (GH-150287)
#150332
[3.15] gh-150285: Fix too long docstrings in the decimal module (GH-150288)
#150333
[3.15] gh-150285: Fix too long docstrings in the _remote_debugging module (GH-150289)
#150334
[3.15] gh-149189: Revert "Modern defaults for `pprint` (GH-149190)" (GH-150249)
#150268
[3.15] gh-149995: Update typing.py docstrings and documentation (GH-149996)
#150215
[3.15] gh-145235: Make dict watcher API thread-safe for free-threaded builds (gh-145233)
#149690
[3.15] gh-150052: Resolve un-loaded lazily loaded submodules via module.__getattr__ instead of publishing lazy values
#150055
[3.15] gh-149474: use `Py_fopen` in `Binary{Reader,Writer}` for audit hook and path-like support (GH-149524)
#149586
[3.15] gh-149902: Remove dead packaging docs link and add a new section for external resources (GH-150030)
#150241
[3.15] gh-149945: Fix potential OOM for gzip with large header (GH-149979)
#150093
[3.15] gh-149079: Fix O(n^2) canonical ordering in unicodedata.normalize() (GH-149080)
#150776
[3.15] gh-148829: Make sentinels' repr and module customizable (GH-149654)
#150092
[3.15] gh-148675: Use a string for ctypes cparam tag (GH-149778)
#149869
[3.15] gh-150389: Make perf profiler tests resilient (GH-150437)
#150515
[3.15] gh-149807: Fix hash(frozendict): compute (key, value) pair hash (GH-149841)
#150149
[3.15] gh-139808: Add branch protections for aarch64 in asm_trampoline.S (GH-130864)
#149730
[3.15] gh-149698: Update bundled expat to 2.8.1 (GH-149699)
#149812
[3.15] gh-112821: Fix rlcompleter failures on objects with descriptors (GH-149577)
#149656
[3.15] gh-149642: Fix interaction between exec and lazy_imports=all (GH-149643)
#149749
[3.15] gh-148906: fix performance scaling of descriptors on free-threading (GH-148915)
#149798
[3.15] gh-148260: Use at least 1 MiB stack size on musl (GH-149993)
#150150
[3.15] gh-86533: Restore os.makedirs() ability to apply *mode* recursively (GH-150011)
#150036
[3.15] gh-149430: Fix edge-cases in `profiling.sampling` outputs (GH-149431)
#149602
[3.15] gh-146452: Improve locking granularity in pickle's batch_dict_exact and fix race condition (GH-150025)
#150039
[3.15] gh-149819: fix .pth and .start file processing in subprocess when inheriting PYTHONPATH (GH-150177)
#150202
[3.15] gh-150429: Fix sampling profiler generator stack test (GH-150433)
#150734

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Top Contributors in v3.15.0b2

miss-islington
colesbury
serhiy-storchaka
savannahostrowski
jihugo
encukou
warsaw
pablogsal
vstinner

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