Cpython: v3.15.0rc1 Release

186 Commits in this Release

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

[3.15] gh-153236: Propagate lazy submodule import errors (GH-153237) (#153936)

Authored July 18, 2026

[3.15] gh-152548: Add a test.support.isolation.runInSubprocess() decorator (GH-152551) (GH-154780)

Authored July 28, 2026

[3.15] gh-154821: fix data races on function attributes (GH-154826) (#154829)

Authored July 28, 2026

[3.15] Improved test coverage for codeop.py. 0

Authored July 31, 2026

[3.15] gh-154189: Fix use-after-free in `functools.partial_vectorcall` (GH-154508) (#154652)

Authored July 27, 2026

[3.15] gh-134745: Remove dead code in `thread_nt.h` left by gh-134747 (GH-154338) (#154655)

Authored July 24, 2026

[3.15] gh-154431: Revert "gh-154431: Fix data race in `sys.audithook` (GH-154462)" (GH-154769) (GH-154774)

Authored July 27, 2026

[3.15] gh-76595: Add tests for PyCapsule_Import() (GH-154588) (GH-154619)

Authored July 24, 2026

[3.15] gh-151955: Allow more ParamSpec and TypeVarTuple bounds (GH-151956) (#152101)

Authored July 27, 2026

[3.15] gh-154275: Do not crash on deeply nested `__parameters__` in `GenericAlias` (GH-154277) (#154306)

Authored July 20, 2026

[3.15] gh-154070: Build the curses module wide by capability, not by name (GH-154071) (GH-154765)

Authored July 28, 2026

[3.15] gh-109638: Fix exponential time in csv.Sniffer for doubled quotes (#154868)

Authored August 3, 2026

[3.15] gh-154211: Skip C-stack exhaustion tests when the C stack is huge (GH-154212) (GH-154216)

Authored July 20, 2026

[3.15] gh-154431: Fix data race in `sys.audithook` (GH-154462) (#154477)

Authored July 22, 2026

[3.15] gh-153419: Fix several issues around bytearray __init__ (GH-153498) (#154622)

Authored July 24, 2026

[3.15] gh-154848: Enforce frame boundaries in the C unpickler (GH-154893) (GH-154977)

Authored July 31, 2026

[3.15] gh-154836: Fix Popen.wait() with very large timeouts on the pidfd/kqueue wait paths (GH-154837) (#154891)

Authored July 29, 2026

[3.15] gh-151022: Fix remote debugging linetable reads (GH-151036) (#154187)

Authored July 19, 2026

[3.15] gh-153291: Fix data race in readline.get_completer() and get_pre_input_hook() (gh-153362) (gh-154418)

Authored July 22, 2026

[3.15] gh-154775: Don't accept duplicate plus sign when matching complex number (GH-154776) (GH-154802)

Authored July 28, 2026

[3.15] GH-138800: Fix variable substitution in python3.pc for Android (GH-144776) (#155107)

Authored August 3, 2026

[3.15] GH-142035: Fix wrapping of colorized argparse help text (GH-154634) (#154644)

Authored July 24, 2026

[3.15] CODEOWNERS: Remove everyone from `removed-ids.txt` (GH-154886) (#154957)

Authored July 30, 2026

[3.15] gh-152674: Avoid quadratic behavior in xml.etree.ElementPath index predicates (GH-152676) (GH-154812)

Authored July 29, 2026

[3.15] gh-151941: Fix Sphinx reference warnings in `Doc/c-api/` (GH-152044) (GH-154920)

Authored July 30, 2026

[3.15] Make `os.get_terminal_size` check `isatty` before calling `ioctl` (GH-154885) (#154903)

Authored July 30, 2026

[3.15] gh-154279: Skip readline completion tests that fail on DragonFly and illumos (GH-154280) (GH-154282)

Authored July 21, 2026

[3.15] gh-153862: Fix spurious color pair in curses window.inch() on a wide build (GH-154703) (GH-154720)

Authored July 26, 2026

[3.15] gh-98820: Fix quadratic time in csv.Sniffer for quoted fields (GH-154867)

Authored August 3, 2026

[3.15] Fix a stale link to the `math.integer.isqrt()` correctness proof (GH-154685) (#154698)

Authored July 25, 2026

[3.15] gh-154283: Make threading.get_native_id() unique across processes on DragonFly (GH-154287) (GH-154293)

Authored July 20, 2026

[3.15] gh-135736: Fix interaction between TaskGroup and aclose() (GH-154649) (#154900)

Authored August 3, 2026

[3.15] gh-154014: Initialize cold executor vm_data fields (GH-154142) (GH-154457)

Authored July 22, 2026

[3.15] gh-122931: Allow stable abi3 API extensions to include a multiarch tuple in the filename (GH-152461) (GH-154772)

Authored July 29, 2026

[3.15] gh-154582: Fix test_invalid_utf8_arg in non-UTF-8 multibyte locales (GH-154584) (GH-154601)

Authored July 24, 2026

[3.15] gh-139445: Skip pyrepl tests if the terminal is not supported (GH-154497) (GH-154529)

Authored July 23, 2026

[3.15] GH-148468: Accept string-like proxy objects in colorized argparse help (GH-154653) (#154946)

Authored July 30, 2026

[3.15] gh-153881: Atomically load `dk_nentries` in `_PyObject_IsInstanceDictEmpty` (GH-153882) (#154349)

Authored July 21, 2026

[3.15] gh-153133: Fix socket leak in error path of asyncio create_connection (GH-153134) (#154631)

Authored July 25, 2026

[3.15] gh-152769: fixup enabling of perf trampoline on musl (Alpine Linux) (#153995)

Authored July 19, 2026