Description

encukou

opened on Mar 30, 2026

Issue body actions

PEP-803 is accepted; this tracks the implementation.

• The Py_TARGET_ABI3T knob (and interplay with Py_LIMITED_API & Py_GIL_DISABLED): gh-146636: PEP 803: add Py_TARGET_ABI3T and .abi3t.so extension #146637
• Opaque PyObject: gh-111506: Add _Py_OPAQUE_PYOBJECT to hide PyObject layout & related API #136505
• Make Py_mod_abi mandatory: gh-146636: Py_mod_abi mandatory for modules created from slots array #146855
• Guard against GIL ABI on FT: gh-137956: Guard against non-free-threaded extensions in free-threaded builds #137957
• importlib.machinery.EXTENSION_SUFFIXES changes: gh-146636: PEP 803: add Py_TARGET_ABI3T and .abi3t.so extension #146637
• Reference Docs: gh-146636: PEP 803: Reference documentation #148013
• Windows python3.dll sharing between builds: Free-threaded and GIL-enabled Windows builds should share an abi3 libpython dll #148690
• Migration Docs: gh-146636: Add Free-threaded Stable ABI migration guide #150580
• Extended tests

Linked PRs

• gh-146636: PEP 803: add Py_TARGET_ABI3T and .abi3t.so extension #146637
• gh-146636: Py_mod_abi mandatory for modules created from slots array #146855
• gh-146636: PEP 803: Reference documentation #148013
• gh-146636: abi3t: Define Py_GIL_DISABLED but do not to use it #148142
• gh-146636: Improve ABI/feature selection, add new header for it #148302
• gh-146636: Add Free-threaded Stable ABI migration guide #148453
• gh-146636: Add Free-threaded Stable ABI migration guide #150580
• [3.15] gh-146636: Add Free-threaded Stable ABI migration guide (GH-150580) #150844

Reacted by impervius

Activity

1. encukou

   self-assigned this

   on Mar 30, 2026
2. StanFromIreland

   added

   type-featureA feature request or enhancementA feature request or enhancement

   interpreter-core(Objects, Python, Grammar, and Parser dirs)(Objects, Python, Grammar, and Parser dirs)

   3.15bugs and security fixesbugs and security fixes

   on Mar 30, 2026
3. neutrinoceros commented on Mar 30, 2026

   

   neutrinoceros

   on Mar 30, 2026

   Contributor

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   @encukou congratz ! Although I think there's a typo in the title and description; you mean PEP 803, right ?

   Reacted by Petr Viktorin
4. kumaraditya303

   changed the title [-]Implement PEP 809 -- abi3t[/-] [+]Implement PEP 803 -- abi3t[/+] on Mar 30, 2026
5. encukou

   added 6 commits that reference this issue on Apr 1, 2026

   gh-146636: PEP 803: add Py_TARGET_ABI3T and .abi3t.so extension (GH-1…

   2452324

   gh-146636: Py_mod_abi mandatory for modules created from slots array (G…

   a86963b

   pythongh-146636: abi3t: Define Py_GIL_DISABLED but make sure not to u…

   0fc14ba

   pythongh-146636: abi3t: Define Py_GIL_DISABLED but make sure not to u…

   cb3c6fe

   gh-146636: abi3t: Define Py_GIL_DISABLED but do not use it (GH-148142)

   fbc1a5b

   pythongh-146636: abi3t: Test that Python.h avoids checking Py_GIL_DIS…

   1116e1e
6. clin1234 commented on Apr 12, 2026

   

   clin1234

   on Apr 12, 2026

   Contributor

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   For Migration Docs, it would be suitable to document adapting to this PEP as a separate HOWTO, is it not?
7. encukou commented on Apr 13, 2026

   

   encukou

   on Apr 13, 2026

   MemberAuthor

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   Yes. I'll to do it when the situation around PyCriticalSection is clearer.
8. encukou

   added a commit that references this issue on Apr 16, 2026

   gh-146636: PEP 803: Reference documentation (GH-148013)

   0fcf2b7
9. 18 remaining items
10. ljfp

    added 5 commits that reference this issue on Apr 25, 2026

    pythongh-146636: PEP 803: add Py_TARGET_ABI3T and .abi3t.so extension (…

    6d8e384

    pythongh-146636: Py_mod_abi mandatory for modules created from slots …

    087e218

    pythongh-146636: abi3t: Define Py_GIL_DISABLED but do not use it (pyt…

    3717be2

    pythongh-146636: PEP 803: Reference documentation (pythonGH-148013)

    cedb210

    pythongh-146636: Improve ABI/feature selection, add new header for it (…

    8abf101
11. gaborbernat

    added 2 commits that reference this issue on May 4, 2026

    👷 ci(build): ship cp315t wheels

    2cfaefe

    ✨ feat(build): support free-threaded Python wheels (#307)

    af025bf
12. ngoldbaum commented on Jun 1, 2026

    

    ngoldbaum

    on Jun 1, 2026 · Hidden as resolved

    show commentMore actions
13. encukou

    added a commit that references this issue on Jun 3, 2026

    gh-146636: Add Free-threaded Stable ABI migration guide (GH-150580)

    c720e18
14. hugovk

    added a commit that references this issue on Jun 3, 2026

    [3.15] gh-146636: Add Free-threaded Stable ABI migration guide (GH-15…

    24f5d3d
15. philthompson10

    added a commit that references this issue on Jun 17, 2026

    pythongh-146636: Add Free-threaded Stable ABI migration guide (python…

    7c4b466
16. serhiy-storchaka

    added

    topic-C-API

    on Jul 3, 2026
17. encukou

    closed this as completedon Jul 30, 2026
18. vstinner commented on Aug 5, 2026

    

    vstinner

    on Aug 5, 2026

    Member

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    encukou closed this as completed1w ago

    Congrats! That's a great achievement for Python 3.15 and Free Threading!

    Reacted by Clément Robert and Chris Eibl

    Reacted by Petr Viktorin
19. encukou commented on Aug 6, 2026

    

    encukou

    on Aug 6, 2026

    MemberAuthor

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    Race conditions for everyone! 🏁

    Reacted by Chris Eibl and Clément Robert

    Reacted by Victor Stinner

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