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Cpython v3.15.0

Cpython: v3.15.0 Release

Release date:

October 9, 2026

Previous version:

v3.15.0rc3 (released October 2, 2026)

Magnitude:

4,608 Diff Delta

Contributors:

4 total committers

Data confidence:

Commits:

27 Commits in this Release

Ordered by the degree to which they evolved the repo in this version.

[3.15] gh-142927: Update Tachyon examples (GH-159050) (#159052)

Authored October 9, 2026

[3.15] Revert backports merged during the 3.15.0 release freeze on 5 October (#158873)

Authored October 5, 2026

[3.15] gh-153364: Make frame, coroutine, and task-waiter chain walks iterative and bounded (GH-153365) (#158813)

Authored October 5, 2026

[3.15] gh-158552: Wait for Windows threads to suspend before blocking sampling (GH-158802) (#158845)

Authored October 5, 2026

[3.15] gh-149302: Fix incorrect docstring in RemoteUnwinder.get_all_awaited_by (GH-149312) (#158805)

Authored October 4, 2026

[3.15] gh-151292: `_remote_debugging`: Do not corrupt the binary file when hitting `OverflowError` (GH-152892) (#158830)

Authored October 5, 2026

[3.15] gh-158574: Stabilize TLBC cache refresh tests (GH-158801) (#158817)

Authored October 5, 2026

[3.15] gh-158540: Add the profiled script's directory to sys.path (GH-158548) (#158844)

Authored October 5, 2026

[3.15] gh-156545: Fix flamegraph export RecursionError on deeply recursive programs (GH-156546) (#158851)

Authored October 5, 2026

[3.15] gh-158539: Fix exception mode missing handlers in generators/coroutines (GH-158581) (#158852)

Authored October 5, 2026

[3.15] gh-152721: Fix quadratic RLE replay time in the profiling binary reader (GH-152722) (#158850)

Authored October 5, 2026

[3.15] gh-156810: Write the profiler's collapsed-stack export as UTF-8 (GH-156811) (#156814)

Authored October 5, 2026

[3.15] Update Docs lockfile to use blurb 2.2.0 (GH-159058) (#159060)

Authored October 9, 2026

[3.15] gh-154060: Fix the `Profile Stats` offsets in the profiling binary format docs and a missing flag (GH-157871) (#158855)

Authored October 5, 2026

[3.15] gh-158522: Fix truncated stack for a task whose coroutine recurses (GH-158526) (#158870)

Authored October 5, 2026

[3.15] gh-142349: Update lazy import comments in whatsnew (GH-158651) (#158652)

Authored October 3, 2026

[3.15] gh-158536: Skip some Android logging tests on OS versions with aggressive "chatty" filtering (GH-158531) (#158537)

Authored October 6, 2026

[3.15] Fix the `sys.remote_exec` row in the audit events table (GH-158940) (#158949)

Authored October 7, 2026

[3.15] Doc: update abi3t build tool support (GH-158171) (#158959)

Authored October 7, 2026

[3.15] gh-158098: Add Setuptools workaround to abi3t migration guide (GH-158405) (#158601)

Authored October 6, 2026

[3.15] gh-133879: Announce final release in What's New in Python 3.15 (GH-158256) (#159053)

Authored October 9, 2026

[3.15] gh-158583: Fix uninitialized memory read in bytes.fromhex() (GH-158584) (#158691)

Authored October 5, 2026

[3.15] gh-158618: Split `test_free_threading` into per-module tests to avoid timeouts (GH-158620) (#158661)

Authored October 3, 2026

[3.15] gh-155811: Add a seqcount to `gc_stats` to prevent torn reads (GH-155828) (#158829)

Authored October 5, 2026

[3.15] gh-158643: Document that `Py_EnterRecursiveCall` uses the C stack, not a counter (GH-158644) (#158653)

Authored October 3, 2026

[3.15] gh-154357: Fix tkinter, ttk and IDLE tests depending on the window manager (GH-154370) (#157063)

Authored October 3, 2026

[3.15] gh-153838: Skip non-regular source files in the heatmap exporter (GH-153839) (#158853)

Authored October 5, 2026

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