Cpython: v3.15.0rc2 Release

137 Commits in this Release

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

[3.15] gh-155725: Remove `PyGILState_Ensure` usage from `tracemalloc` (GH-156409) (#156628)

Authored August 31, 2026

[3.15] gh-155519: fix data-race for Context.ctx_vars (GH-155522) (#155893)

Authored August 19, 2026

[3.15] gh-155292: Don't consider Unicode codepoint attributes outside RFC 3454 (GH-155293) (#156017)

Authored August 18, 2026

[3.15] gh-154085: Avoid duplicating diff line values (GH-154099) (#156385)

Authored August 26, 2026

[3.15] gh-151377: Fix races updating type slots and subclasses (GH-155370) (#155821)

Authored August 19, 2026

[3.15] gh-154086: Fix flamegraph thread sample counts (GH-154104) (#155489)

Authored August 10, 2026

[3.15] gh-155400: Fix deadlock with type_lock_prevent_release() (GH-155401) (#155822)

Authored August 19, 2026

[3.15] gh-148817: Fold long lists/sets of constant elements into constant tuples/frozensets (GH-149016) (#155897)

Authored August 19, 2026

[3.15] gh-156369: Update OpenSSL error ID data (GH-156380) (#156392)

Authored August 26, 2026

[3.15] gh-155974: Restore the window attributes when a curses write fails (GH-155975) (#156136)

Authored August 29, 2026

[3.15] gh-67765: Add tests for wsgiref.validate (GH-112398) (#155622)

Authored August 27, 2026

[3.15] gh-154059: Fix Tachyon flame graph time units (GH-154036) (#155597)

Authored August 12, 2026

[3.15] idlelib tests: Fix refleak testing of test_zzdummy (GH-155393) (#155718)

Authored August 14, 2026

[3.15] gh-153711: Add runtime guards for dup3 & pipe2 (GH-155174) (#155202)

Authored August 5, 2026

[3.15] gh-154467: Fix empty (Pdb) prompt when attaching to a process with pdb -p (GH-154469) (GH-156397)

Authored August 26, 2026

[3.15] gh-154088: Count elided stacks consistently (GH-154093) (#156386)

Authored August 25, 2026

[3.15] gh-155194: Fix not raising on non-module import (GH-155189) (#155983)

Authored August 19, 2026

[3.15] gh-155781: Hold strong references to sqlite3 converters (GH-155784) (#156192)

Authored August 29, 2026

[3.15] gh-155468: Distinguish empty quoted tokens from EOF in netrc (GH-155471) (#156464)

Authored August 31, 2026

[3.15] gh-98894: Fix dtrace tests in shared builds (GH-153372) (#155803)

Authored August 19, 2026

[3.15] gh-155702: Fix sqlite3.Blob slice assignment with a step (GH-155703) (#155765)

Authored August 19, 2026

[3.15] gh-110793: Add CI job that runs tests with an installed build (GH-152664) (#155483)

Authored August 10, 2026

[3.15] gh-129752: Don't update adaptive counters when TLBC=0 in free-threading

Authored August 26, 2026

[3.15] gh-151365: Revert temporary Git downgrade (GH-156584) (#156588)

Authored August 29, 2026

[3.15] gh-154196: Improve `AttributeError` messages from unresolved lazy imports (GH-154688) (#155899)

Authored August 19, 2026

[3.15] gh-156353: Fix configparser space delimiter parsing (GH-156382) (#156557)

Authored August 29, 2026

[3.15] gh-155430: fix `hmac.digest` bigmem test (GH-155431) (#155846)

Authored August 27, 2026

[3.15] gh-154701: prevent executor self-links in JIT cold exits (GH-155323) (#155832)

Authored August 25, 2026

[3.15] gh-155888: Fix asyncio writelines() hanging on an empty chunk (GH-155889) (#155904)

Authored August 29, 2026

[3.15] gh-155752: Do not crash when GenericAlias parameters change during substitution (GH-155761) (#155770)

Authored August 14, 2026

[3.15] gh-155727: Ignore internal imports in test_attribute_completion (GH-155730) (#155769)

Authored August 27, 2026

[3.15] gh-156523: Fix asyncio.as_completed() not recording the awaiting task (GH-156527) (#156552)

Authored August 29, 2026

[3.15] gh-155952: Fix `<unrepresentable>` Argument Clinic defaults in several signatures (GH-155954) (#156165)

Authored August 29, 2026

[3.15] gh-155869: Fix data loss in dbm.dumb.reorganize() (GH-155872) (#155874)

Authored August 19, 2026

[3.15] gh-156404: Restore the 'fullname' variable for .pth import lines (GH-156406) (#156431)

Authored August 27, 2026

[3.15] gh-154566: Fix array.byteswap() corrupting 'Zd' arrays with more than one element (GH-154567) (#155756)

Authored August 14, 2026

[3.15] gh-154568: Fix array unpickling of little-endian float16 (GH-154569) (#155557)

Authored August 12, 2026

[3.15] Update list of files generated by `generate_token.py` (GH-155524) (#155840)

Authored August 17, 2026

[3.15] gh-156369: Update CI to use latest SSL library versions (GH-156381) (#156389)

Authored August 26, 2026

[3.15] gh-155254: Avoid warning about missing stdlib when using _pth files (GH-156015) (#156182)

Authored August 25, 2026