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Cpython v3.15.0b3

Cpython: v3.15.0b3 Release

Release date:
June 23, 2026
Previous version:
v3.15.0b2 (released June 2, 2026)
Magnitude:
3,788 Diff Delta
Contributors:
8 total committers
Data confidence:
Commits:
191 impacting commits

104 Features Released with v3.15.0b3

[3.15] gh-150899: Do not reset custom `-Xlazy_imports` mode in `test_lazy_imports` (GH-150900)
#150947
[3.15] Use `time.monotonic` in OrderedDict LRU cache example (GH-150986)
#150991
[3.15] gh-150207: Raise MemoryError on tokenizer allocation failure instead of crashing (GH-150275)
#150996
[3.15] Mention `frozendict` in `object.__hash__()` documentation (GH-148867)
#151077
[3.15] gh-151126: Fix missing `PyErr_NoMemory()` in `remove_unused_consts` (GH-151127)
#151134
[3.15] GH-61082: Clarify nargs='*' positional default behavior (GH-150989)
#151168
[3.15] gh-151126: Add missing `PyErr_NoMemory` in `_winapi` module (GH-151154)
#151180
[3.15] GH-54732: Tweak wording around empty lines in argument files (GH-150980)
#151165
[3.15] gh-151159: Update macOS installer to use OpenSSL 3.5.7. (GH-151171)
#151192
[3.15] GH-59633: Clarify dest collisions in argparse docs (GH-150987)
#151188
[3.15] gh-151112: Fix double free in `assemble_init` when out of memory (GH-151142)
#151205
[3.13] gh-80384: Fix docs for PyWeakref_NewRef() and PyWeakref_NewProxy() (GH-151146)
#151233
[3.15] gh-89554: Document socket.SocketType as a class (GH-150683)
#151244
[3.15] gh-150988: Fix refleak in `OSError` when attrs are set before `super().__init__()` (GH-150990)
#151240
[3.15] add asyncio guide for Free-Threaded Python (GH-150456)
#151257
[3.15] gh-151126: Fix missing memory errors in `_interpchannelsmodule.c` (GH-151239)
#151265
[3.15] Docs: Fix typos in the "Memory Management" section (GH-151243)
#151247
[3.15] gh-151238: Check for `_get_resized_exprs` failure in `_PyPegen_{joined,template}_str` (GH-151259)
#151344
[3.15] gh-123619: Fix PyUnstable_Object_EnableDeferredRefcount() (GH-151260)
#151326
[3.15] gh-151112: Move an `assert` that may fail in `cfg_builder_check` (GH-151153)
#151313
[3.15] Drop historical `:author:`s from HOWTOs (GH-151091)
#151310
[3.15] gh-101100: Fix Sphinx nitpick in `unittest.mock.rst` (GH-151302)
#151355
[3.15] gh-151126: Fix missing memory error in `os._path_splitroot` (GH-151339)
#151360
[3.15] gh-150397: Fix pyexpat bigmem test (GH-151329)
#151348
[3.15] Fix typos in the `curses.ascii` module documentation (GH-129300)
#151413
[3.15] Docs: avoid repetitions of class references in functions.rst (GH-150891)
#151405
[3.15] gh-151126: Fix crash on unset memory error in `ctypes.get_errno` (GH-151382)
#151398
[3.15] Docs: Fix method directive signatures in `enum` docs (GH-151429)
#151434
[3.15] gh-151443: Fix documented default of `unittest.mock.mock_open`'s `read_data` parameter (GH-151444)
#151450
[3.15] gh-151390: Colorize `match +` and `match -` in the REPL (GH-151391)
#151476

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Top Contributors in v3.15.0b3

miss-islington
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