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Cpython v3.15.0a2

Cpython: v3.15.0a2 Release

Release date:
March 7, 2026
Previous version:
v3.15.0a1 (released October 14, 2025)
Magnitude:
7,641 Diff Delta
Contributors:
43 total committers
Data confidence:
Commits:
164 impacting commits

276 Features Released with v3.15.0a2

[3.14] gh-140373: Correctly emit `PY_UNWIND` event when generator is closed (GH-140767)
#140816
gh-140438: Properly run the asyncio REPL in REPL tests
#140298
gh-140729: Add __mp_main__ as a duplicate for __main__ for pickle to work
#140735
gh-137969: Fix evaluation of `ref.evaluate(format=Format.FORWARDREF)` objects
#138075
gh-140260: Fix data race in _struct module initialization with subinterpreters
#140909
[3.14] gh-140936: Fix JIT assertion crash at finalization if some generator is alive (GH-140969)
#141494
GH-140768: Warn when the WASI SDK version doesn't match the supported version
#140769
GH-119668: expose importlib.machinery.NamespacePath
#119669
gh-141174: Improve `annotationlib._Stringifier` test coverage
#141220
gh-139434: Update selected RFC 2822 references to RFC 5322
#139435
gh-140067: Fix memory leak in sub-interpreter creation
#140111
gh-140938: Raise ValueError for infinite inputs to stdev/pstdev
#141531
gh-76007: Deprecate `__version__` attribute in `imaplib`
#140299
gh-140607: Validate returned byte count in RawIOBase.read
#140611
[3.13] gh-101828: Fix `jisx0213` codecs removing null characters (gh-139340)
#140112
Add details about JIT build infrastructure and updating dependencies to `Tools/jit`
#141167
gh-136702: Clear codec caches for refleak tests; use test.support helpers
#141345
gh-140916: Remove unused codes in winreg.c
#140934
gh-100218: correctly set `errno` when `socket.if_{nametoindex,indextoname}` raise `OSError`
#140905
[3.13] gh-140406: Fix memory leak upon `__hash__` returning a non-integer (GH-140411)
#140441
gh-141174: Improve `ForwardRef` test coverage
#141175
gh-140082: Forward colorizing from libregrtest to unittest
#140083
gh-133346: add tests for `_colorize.Theme`
#139687
gh-141174: Improve `annotationlib.call_annotate_function()` test coverage
#141176
gh-140041: Fix import of `ctypes` on Android and Cygwin when ABI flags are present
#140178
gh-140729: Fix subprocess handling in test_process_pool_executor_pickle
#141688
gh-129005: Remove copies from _pyio using take_bytes
#141539
gh-140482: Preserve and restore `stty echo` as a test environment
#140519
GH-136895: Fixes for pulling LLVM as a release artifact
#141002
gh-76007: Deprecate `zlib.__version__` attribute
#140130

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Top Contributors in v3.15.0a2

johnslavik
nascheme
efimov-mikhail
StanFromIreland
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jihugo
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