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Cpython v3.15.0a3

Cpython: v3.15.0a3 Release

Release date:
December 16, 2025
Previous version:
v3.15.0a2 (released December 8, 2025)
Magnitude:
9,066 Diff Delta
Contributors:
47 total committers
Data confidence:
Commits:
121 impacting commits

213 Features Released with v3.15.0a3

GH-132657: Add lock-free set contains implementation
#132290
GH-142305: JIT: Deduplicating GOT symbols in the trace
#142316
gh-138122: Add inverted flamegraph
#142288
gh-138122: Make Tachyon flamegraph and heatmap output more similar
#142590
gh-141691: Apply ruff rules to Apple folder.
#141694
gh-69113: Fix doctest to report line numbers for __test__ strings
#141624
gh-76007: `pydoc`: Catch `DeprecationWarning` for stdlib module `__version__` attributes
#139997
gh-131178: Add tests for `pickletools` command-line interface
#131287
gh-142466: Pixi package definitions for downstream use
#142469
gh-142315: Don't pass the "real path" of Pdb script target to system functions
#142371
gh-138122: Tachyon Flamegraph: Make toggle keyboard accesible and adjust sidebar collapse CSS
#142638
gh-141939: Add colors to interpolated values in argparse
#141940
gh-48752: Add readline.get_pre_input_hook() function
#141586
gh-76007: Deprecate `__version__` attribute in `ctypes`
#142679
gh-141081: Add a `.gitignore` file to `__pycache__` folders
#141162
gh-141863: Use bytearray.take_bytes in asyncio.streams
#141864
gh-42400: Fix buffer overflow in _Py_wrealpath for long paths
#141529
gh-138122: Add docs button to Tachyon heatmap and flamegraph
#142614
gh-139946: distinguish stdout or stderr when colorizing output in argparse
#140495
gh-142539: Fix `traceback` caret location calculation for `SyntaxError`s with wide chars
#142540
gh-142451: correctly copy HMAC attributes in `HMAC.copy()`
#142510
Fix disk space issues in Android CI
#142289
gh-142278: Add granular change detection for platforms in CI
#142350
gh-76007: Deprecate `__version__` attribute in `wsgiref.simple_server`
#142675
gh-139546: Update `test_zoneinfo` data to 2025c
#139547
Tachyon: Fix unnecessary plural when there is a single file/sample
#142478
gh-60107: Remove a copy from RawIOBase.read
#141532
gh-138122: Tachyon heatmap: Make toggle switches keyboard accessible
#142601
gh-84530: fix namespace package support in modulefinder
#29196
gh-141692: Add a slice-specific lib folder to iOS XCframeworks.
#141693

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Top Contributors in v3.15.0a3

Zheaoli
StanFromIreland
nascheme
cmaloney
ZeroIntensity
diegorusso
ivonastojanovic
donBarbos
CuriousLearner
jihugo

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