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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-140253: Improve the syntax error from an ill-positioned double-star subpattern
#140254
GH-140643: Add `<native>` and `<GC>` frames to the sampling profiler
#141108
gh-139817: Attribute `__qualname__` is added to `TypeAliasType`
#139919
gh-139877: Use PyBytesWriter in pycore_blocks_output_buffer.h
#139976
gh-129117: Expose `_PyUnicode_IsXidContinue/Start` in `unicodedata`
#140269
Minor fixes to `idle.rst` and regenerate `help.html`
#140037
gh-140550: Use a bool for the Py_mod_gil value
#141519
gh-131527: Stackref debug borrow checker
#140599
gh-140551: Fix `dict` crash if `clear` is called at `lookup` stage
#140558
gh-141367: Use CALL_LIST_APPEND instruction only for lists, not for list subclasses
#141398
Make printing log lines to the terminal a little cleaner when building WASI
#140772
gh-139951: Tests on tuple tracking
#140575
gh-76007: Deprecate `__version__` attribute in `decimal`
#140302
gh-138764: annotationlib - Make `call_annotate_function` fallback to using `VALUE` annotations if both the requested format and `VALUE_WITH_FAKE_GLOBALS` are not implemented
#138803
gh-137969: Fix evaluation of `ref.evaluate(format=Format.FORWARDREF)` objects
#138075
gh-137969: Fix double evaluation of `ForwardRef`s which rely on globals
#140974
gh-111389: replace deprecated occurrences of `_PyHASH_*` macros
#141236
GH-116946: Eliminate the need for the GC in the `_thread.lock` and `_thread.RLock`
#141268
gh-135953: Simplify GC markers in the tachyon profiler
#141666
gh-141018: Update `.exe`, `.dll`, `.rtf` and `.jpg` mime types in `mimetypes`
#141023
gh-140189: Add CI job to test iOS builds.
#140190
gh-137821: Improve Argument Clinic definitions in the ``_json`` module
#140780
gh-140530: fix a reference leak in an error path for `raise exc from cause`
#140908
gh-141042: fix sNaN's packing for mixed floating-point formats
#141107
[3.13] gh-141311: Avoid assertion in BytesIO.readinto() (GH-141333)
#141478
GH-139946: Colorize error and warning messages in argparse
#140695
gh-140260: Fix data race in _struct module initialization with subinterpreters
#140909
gh-85524: Raise "UnsupportedOperation" on FileIO.readall
#141214
gh-141174: Improve `annotationlib._Stringifier` test coverage
#141220
GH-140479: Update JIT builds to use LLVM 21
#140973

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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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