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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:
8,171 Diff Delta
Contributors:
43 total committers
Data confidence:
Commits:
164 impacting commits

273 Features Released with v3.15.0a2

gh-141376: Rename _AsyncioDebug to _Py_AsyncioDebug
#141391
`Lib/idlelib`: remove commented out duplicate code
#140259
gh-133346: make `_colorize.Argparse` kw-only constructible
#140620
gh-141464: a typo in profiling sampling when can not run warning in linux
#141465
gh-141004: deprecate Py_MATH_El and Py_MATH_PIl macros
#141035
Fix typo in URLError Comment
#139874
gh-141125: delete unused import textwrap in interpreter.py
#141126
GH-108009: Add clarification of parser and argument defaults in argparse docs
#124154
gh-131885: Document `*` for `code.InteractiveConsole`
#132029
gh-138944: Fix `SyntaxError` message for invalid syntax following valid import-as statement
#138945
gh-140141: Properly break exception chain in `importlib.metadata.Distribution.from_name`
#140142
gh-83714: Disable os.statx_result.stx_atomic_write_unit_max_opt
#140162
Update documented minimum required zlib library version
#140116
gh-140137: Handle empty collections in profiling.sampling
#140154
gh-140078: fix typo in tkinter docs
#140081
gh-129813: Enhance PyBytesWriter documentation
#140152
Memory leak in `hmac` module with HACL* backend detected by AddressSanitizer
#140120
gh-116738: Test uuid module for free threading
#140068
Remove duplicate words in the documentation
#140221
gh-140149: use `PyBytesWriter` in `action_helpers.c`'s `_build_concatenated_bytes`; 3x faster `bytes` concat in the parser
#140150
gh-138859: Account for `ParamSpec` defaults that are not lists โ€ฆ
#138868
gh-83714: Check for struct statx.stx_atomic_write_unit_max_opt in configure
#140185
Set type names earlier in posixmodule.c
#140168
gh-139817: typing docs: Fix indentation of `.. versionadded::` note for `TypeAliasType.__qualname__`
#140177
gh-140135: use `PyBytesWriter` in `io.RawIOBase.readall`; 3.98x faster
#140139
gh-83714: Implement os.statx
#139178
gh-139817: Fix refleak in TypeAliasType(qualname=non_string)
#140197
gh-140239: Check statx availability only in Linux platforms
#140249
gh-133059: fix `Tools/build/deepfreeze.py` nsmallposints
#139906
gh-140166: Use `application/texinfo` as sole MIME type for `.texi` and `.texinfo` files
#140165

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Top Contributors in v3.15.0a2

efimov-mikhail
johnslavik
nascheme
StanFromIreland
jihugo
picnixz
emmatyping
ashm-dev
sharktide
cmaloney

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