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Cpython v3.15.0a4

Cpython: v3.15.0a4 Release

Release date:
January 13, 2026
Previous version:
v3.15.0a3 (released December 16, 2025)
Magnitude:
2,989 Diff Delta
Contributors:
18 total committers
Data confidence:
Commits:
27 impacting commits

35 Features Released with v3.15.0a4

gh-142560: bytearray: prevent UAF in search-like methods by exporting self buffer
#142938
gh-138122: Improve bytecode panel
#142910
gh-142927: Tachyon: Start with user's default light/dark theme
#142987
gh-84232: Fix `pydoc` docs.python.org link generation
#139995
gh-76007: Deprecate `VERSION` in `xml.etree.ElementTree` & `version` in `xml.sax.expatreader` & `xml.sax.handler`
#142898
gh-138122: Update Tachyon dark theme colors
#142841
JIT: Rename trampoline.c to shim.c
#142974
GH-100964: Fix reference cycle in exhausted generator frames
#141112
gh-143046: Make asyncio REPL respect the `-q` flag (quiet mode)
#143047
gh-142836: Avoid /proc fd pipes on Solaris
#142853
gh-142784: Make the asyncio REPL call `.close()` on the loop
#142785
gh-91048: Refactor common data into context object in Modukes/_remote_debugging
#142879
gh-142873: Do not check for `PyContextVar_CheckExact` twice in `PyContextVar_Set`
#142874
gh-142876: Remove reference to thread in documentation of `asyncio.Queue.shutdown`.
#142888
gh-138122: Validate base frame before caching in remote debugging frame cache
#142852
Use other name for JIT contributor
#142877
gh-139038: Add JIT What's New for 3.15
#142845
gh-142859: Add `Tools/check-c-api-docs` to mypy check
#142860
gh-142654: show the clear error message when sampling on an unknown PID
#142655
gh-140374: Add glossary entries related to multithreading
#140375
gh-142752: add more thread safety tests for mock
#142791
gh-142890: remove unnecessary interp parameter from dict functions and `_PyDict_NotifyEvent`
#142923
gh-143012: PyBytes_FromStringAndSize should have a Py_ssize_t passed
#143013
gh-142527: Docs: Clarify that random.seed() discards the sign of an integer input
#142483
GH-134584: Remove redundant refcount for `BINARY_OP_SUBSCR_STR_INT`
#142844
gh-142145: relax the no-longer-quadratic test timing
#143030
gh-142834: pdb commands command should use last available breakpoint
#142835
gh-129069: fix more thread safety issues in list
#143019
gh-143057: avoid lock in tracemalloc APIs when it is not enabled
#143065
gh-142927: Tachyon: Comma separate thousands and fix singular/plurals
#142934

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Top Contributors in v3.15.0a4

Zheaoli
chris-eibl
fatelei
jihugo
ivonastojanovic
StanFromIreland
LindaSummer
stratakis
diegorusso
benjaminJohnson2204

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