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Cpython v3.12.0a1

Cpython: v3.12.0a1 Release

Release date:
October 24, 2022
Previous version:
v3.11.16 (released August 12, 2026)
Magnitude:
26,601 Diff Delta
Contributors:
33 total committers
Data confidence:
Commits:
800 impacting commits

125 Features Released with v3.12.0a1

[3.11] gh-95778: CVE-2020-10735: Prevent DoS by very large int()
#96500
[3.11] gh-91162: Fix substitution of unpacked tuples in generic aliases (GH-92335)
#92484
[3.11] GH-94739: Backport GH-94958 to 311
#94965
[3.11] GH-96636: Remove all uses of NOTRACE_DISPATCH (GH-96643)
#96688
gh-91321: Fix compatibility with C++ older than C++11
#93784
[3.11] gh-97897: Prevent os.mkfifo and os.mknod segfaults with macOS 13 SDK (GH-97944)
#97969
[3.11] gh-94731: Revert to C-style casts for _Py_CAST (GH-94782)
#94849
gh-92781: Avoid mixing declarations and code in C API
#92783
[3.11] GH-92678: Expose managed dict clear and visit functions (GH-95246).
#95256
LWPCookieJar.save() creates *.lwp file in 644 mode
#79096
[3.11] gh-95191: IDLE: Include prompts when saving Shell GH-95554
#95557
[3.11] Fix inconsistent return type for statistics median_grouped() gh-92531 (GH-92533)
#92656
[3.11] GH-96071: fix deadlock in PyGILState_Ensure (GH-96124)
#96129
[3.11] GH-74116: Allow multiple drain waiters for asyncio.StreamWriter (GH-94705)
#96395
[3.11] GH-94438: Backport GH-94444
#94486
[3.11] GH-93662: Make sure that column offsets are correct in multi-line method calls. (GH-93673)
#93895
[3.11] GH-90081: Run python tracers at full speed (GH-95328)
#95363
gh-93937, C API: Move PyFrame_GetBack() to Python.h
#93938
[3.11] GH-94262: Don't create frame objects for frames that aren't yet complete. (GH-94371)
#94482
[3.11] GH-96569: Avoid undefined behavior
#96616
[3.11] gh-93382: Cache result of `PyCode_GetCode` in codeobject (GH-93383)
#93493
[3.11] gh-93297: Make asyncio task groups prevent child tasks from being GCed (GH-93299)
#93305
[3.11] gh-95132: Correctly relay *args and **kwds from sqlite3.connect to factory (GH-95146)
#95158
[3.11] bpo-45924: Fix asyncio incorrect traceback when future's exception is raised multiple times (GH-30274)
#94747
[3.11] gh-94823: Improve coverage in tokenizer.c:valid_utf8 (GH-94856)
#96029
[3.11] gh-90622: Do not spawn ProcessPool workers on demand via fork method. (GH-91598)
#92495
[3.11] Revert "gh-93910: [Enum] restore member.member restriction while keeping performance boost (GH-94913)"
#94981
[3.11] GH-96612: Skip incomplete frames in tracemalloc traces. (GH-96613)
#96617
[3.11] gh-95174: Add pthread stubs for WASI (GH-95234)
#95503
[3.11] GH-95818: Skip incomplete frames in `PyThreadState_GetFrame` (GH-95886)
#95890

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Top Contributors in v3.12.0a1

miss-islington
tiran
pablogsal
markshannon
Yhg1s
belm0
brandtbucher
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serhiy-storchaka
ambv

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