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Cpython v3.15.0b4

Cpython: v3.15.0b4 Release

Release date:
July 18, 2026
Previous version:
v3.15.0b3 (released June 23, 2026)
Magnitude:
4,592 Diff Delta
Contributors:
8 total committers
Data confidence:
Commits:
289 impacting commits

186 Features Released with v3.15.0b4

[3.15] gh-152847: Reject POSIX TZ rule with non-digit day-of-year in `_zoneinfo.py` (GH-152848)
#152910
[3.15] gh-98894: Check readelf failures in test_dtrace (GH-152345)
#152891
[3.15] gh-146531: Skip hanging `wm iconbitmap` test on macOS 26 Intel (GH-148032)
#153190
[3.15] gh-152356: Fix Windows blocking sampling after target process exit (GH-152471)
#152512
[3.15] gh-151040: Fix `test_c_stack_unwind` on RISC-V (GH-152370)
#152819
[3.15] gh-152849: Fix `OverflowError` message for out-of-range timestamps in the `time` module (GH-152850)
#153209
[3.15] gh-152492 Allow `OrderedDict.update` to work with `frozendict` (GH-152494)
#152630
[3.15] gh-152951 - Fix double DECREF when `newblock` fails during deque.extend calls (GH-152961)
#152971
[3.15] gh-152785: Upgrade LLVM to LLVM 21 in GitHub Action jobs (GH-152781)
#152968
[3.15] gh-151942: Fix all Sphinx nitpicks in the Python 2.4 What's New (GH-153116)
#153503
[3.15] gh-152060: Fix `_pydatetime.fromisoformat()` raising `AssertionError` on invalid lengths (GH-152061)
#152081
[3.15] gh-152870: Fix compile error with decimal when EXTRA_FUNCTIONALITY enabled (GH-152871)
#152937
[3.15] gh-148286: Remove invalid test in `test_decodeescape` (GH-153187)
#153204
[3.15] gh-153210: Restore accidental `array.ArrayType` removal (GH-153261)
#153274
[3.15] gh-151126: Add missing `PyErr_NoMemory()` in `type_from_slots_or_spec` (GH-151582)
#152016
[3.15] gh-151126: Add missing `PyErr_NoMemory` in `_winapi.c` (GH-151588)
#152182
[3.15] gh-153210: Fix `array` module import crash under a memory pressure (GH-153238)
#153249
[3.15] gh-145098: Use `macos-26[-intel]` instead of `macos-15[-intel]` in `{jit,tail-call}.yml` (GH-153194)
#153328
gh-152769: Enable perf trampoline on Alpine
#152774
[3.15] gh-90949: Fix copy-paste typo in pyexpat capsule API initialization (GH-151147)
#152088
[3.15] gh-152079: Fix `_datetime.fromisoformat()` mishandling a sub-second tz offset (GH-152087)
#152174
[3.15] gh-152903: Change PCWSTR to PWSTR in GetThreadDescription() typedef (GH-152904)
#152943
[3.15] gh-150641: Fix evaluating forward references in STRING format can 'leak' internal names in `typing` (GH-150648)
#152935
[3.15] gh-153293: Clear opcode statistics in the live profiler's reset_stats() (GH-153295)
#153586
[3.15] Capitalize first word in `unittest.mock.assert_*` docs and docstrings (GH-151951)
#152059
[3.15] GH-150605: use windows-2025 in GitHub Actions (GH-150606)
#151939
[3.15] gh-152052: Fix misleading `json` error for `\uXXXX` escape at the end of input (GH-152053)
#152283
[3.15] gh-98894: Check tracer exit status in test_dtrace (GH-152893)
#152900
[3.15] gh-145098: Use `macos-26-intel` instead of `macos-15-intel` (GH-149991)
#153179
[3.15] Seed pip caches for docs on `main`/`3.x` branches (GH-153127)
#153231

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Top Contributors in v3.15.0b4

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