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Cpython v3.15.0b1

Cpython: v3.15.0b1 Release

Release date:
May 7, 2026
Previous version:
v3.15.0a8 (released April 7, 2026)
Magnitude:
66,082 Diff Delta
Contributors:
98 total committers
Data confidence:
Commits:
320 impacting commits

281 Features Released with v3.15.0b1

gh-148883: Docs: clarify grammar in Counter dictionary methods note
#148882
[3.13] gh-148808: Add boundary check to asyncio.AbstractEventLoop.sock_recvf… (GH-148809)
#148836
[3.14] gh-113956: Make intern_common thread-safe in free-threaded build (gh-148886)
#148927
[3.13] gh-142965: Fix Concatenate documentation to reflect valid use cases (GH-143316)
#148900
[3.13] gh-145194: Fix typing in re tokenizer example (GH-145198)
#148898
[3.14] Additional itertool recipes for running statistics (gh-148879)
#148949
gh-148663: Document that IllegalMonthError inherits from both ValueError and IndexError
#148664
gh-140727: Update tachyon logo
#148965
gh-148973: fix segfault on mismatch between consts size and oparg in compiler
#148974
[3.13] Docs: Fix some typos in `calendar.rst` (GH-148756)
#148796
[3.13] gh-82665 Mention that HTMLParser.handle_starttag value can be None (GH-134312)
#149038
gh-148868: Increase test coverage for `cmath.isinf`
#148869
Fix typo in `ceval.c` error message
#148860
[3.13] Document that multiprocessing treats local same-user processes as trusted (GH-149001)
#149034
Build docs from `pylock.toml`
#149058
gh-108951: document addition of TaskGroup.cancel()
#149031
gh-149119: docs: mention that sentinel does not support subclassing
#149120
[3.13] gh-149035: Modernize legacy Python patterns in `Doc/tutorial/stdlib2.rst` (GH-149036)
#149090
gh-149122: Fix segfault in compiler when certain builtin functions are passed a coroutine as arg
#149138
Revert pylock.toml change to make MSI builds pass
#149175
GH-145378: Use PyREPL as the default input console for pdb
#145379
gh-149083: Use `sentinel` in `functools.rst` docs
#149176
GH-148932: Improve error message if profiling.sampling run from venv on Windows platform
#149247
[3.13] gh-148518 fix index error in local part attribute (GH-148522)
#149199
[3.13] Fix source link in `Doc/howto/descriptor.rst` (GH-149215)
#149251
gh-139038: Update final JIT figures for 3.15b1
#149210
gh-148726: Document the GC change in What's New in Python 3.14
#149209
gh-137840: Document PEP 728
#149207
[3.13] gh-149267: Document ast.Constant.kind attribute (GH-149268)
#149294
[3.13] gh-149117: Set `ImportError.name` on errors from `runpy.run_module`/`run_path` (gh-149159)
#149258

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Top Contributors in v3.15.0b1

NekoAsakura
markshannon
kumaraditya303
eendebakpt
pablogsal
encukou
jihugo
serhiy-storchaka
sergey-miryanov
diegorusso

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