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Implement PEP 793 – PyModExport #140550

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Implement PEP 793 – PyModExport#140550
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interpreter-core(Objects, Python, Grammar, and Parser dirs)topic-C-APItype-featureA feature request or enhancement

Description

@encukou
encukou
opened on Oct 24, 2025

Feature or enhancement

Proposal:

See PEP 793. I'll copy the abstract for reference:

In this PEP, we propose a new entry point for C extension modules, by which one can define a module using an array of PyModuleDef_Slot structures without an enclosing PyModuleDef structure. This allows extension authors to avoid using a statically allocated PyObject, lifting the most common obstacle to making one compiled library file usable with both regular and free-threaded builds of CPython.

To make this viable, we also specify new module slot types to replace PyModuleDef’s fields, and to allow adding a token similar to the Py_tp_token used for type objects.

We also add an API for defining modules from slots dynamically.

The existing API (PyInit_*) is soft-deprecated. (That is: it will continue to work without warnings, and it’ll be fully documented and supported, but we plan to not add any new features to it.)

Optional stretch goals:

Has this already been discussed elsewhere?

No response given

Links to previous discussion of this feature:

No response

Linked PRs

See also:

Activity

  1. encukou
    added
    type-featureA feature request or enhancement
    on Oct 24, 2025
  2. StanFromIreland
    added
    interpreter-core(Objects, Python, Grammar, and Parser dirs)
    topic-C-API
    on Oct 24, 2025
  3. encukou
    added a commit that references this issue on Nov 5, 2025

    gh-140550: Initial implementation of PEP 793 – PyModExport (GH-140556)

    589a03a
  4. vstinner
    added 2 commits that reference this issue on Nov 5, 2025

    pythongh-140550: Run make regen-limited-abi

    dd03049

    gh-140550: Run make regen-limited-abi (#141056)

    579b2f8
  5. encukou
    added 2 commits that reference this issue on Nov 7, 2025

    pythongh-140550: PEP 793 reference documentation

    0142b5d

    pythongh-140550: Removp PyInit function from test_cext

    1ad68bf

  6. encukou commented on Nov 13, 2025

    @encukou
    encukou
    on Nov 13, 2025
    MemberAuthor

    I'd appreciate a review of the reference docs update: #141197

  7. encukou
    added 2 commits that reference this issue on Nov 13, 2025

    pythongh-140550: Use a bool for the Py_mod_gil value

    36dcf00

    gh-140550: Use a bool for the Py_mod_gil value (GH-141519)

    a4dd662
  8. encukou
    added a commit that references this issue on Nov 26, 2025

    gh-140550: PEP 793 reference documentation (GH-141197)

    d7f0214
  9. StanFromIreland
    added 3 commits that reference this issue on Dec 6, 2025

    pythongh-140550: Initial implementation of PEP 793 – PyModExport (pyt…

    7e30dee

    pythongh-140550: Run make regen-limited-abi (python#141056)

    2d83666

    pythongh-140550: Use a bool for the Py_mod_gil value (pythonGH-141519)

    ae32d26

  10. 9 remaining items

  11. thunder-coding
    added a commit that references this issue on Feb 15, 2026

    pythongh-140550: allow slots that repeat information from PyModuleDef (…

    3931535

  12. davin-core commented on Mar 24, 2026

    @davin-core
    davin-core
    on Mar 24, 2026

    @encukou I am trying to update a library to include this feature in 3.15, and I am wondering if the PY_VERSION_HEX for this version is 0x030F0000. Does this version exist?

  13. ljfp
    added a commit that references this issue on Apr 25, 2026

    pythongh-140550: allow slots that repeat information from PyModuleDef (…

    4c9469d
  14. encukou
    added a commit that references this issue on May 5, 2026

    gh-140550: Single What's New highlight for PEPs 793, 803 and 820 (GH-…

    02d02f4
  15. encukou
    added 2 commits that reference this issue on May 13, 2026

    gh-140550: Update xxlimited with 3.15 limited API (GH-142827)

    fa81cd9

    [3.15] gh-140550: Update xxlimited with 3.15 limited API (GH-142827) (G…

    b650305

  16. encukou commented on Jun 18, 2026

    @encukou
    encukou
    on Jun 18, 2026
    MemberAuthor

    @davin-core

    I am trying to update a library to include this feature in 3.15, and I am wondering if the PY_VERSION_HEX for this version is 0x030F0000. Does this version exist?

    Sorry, I missed the notification.

    To use wording in the docs: 0x030F0000 does not correspond to any Python release, but is useful in numeric comparisons.

    You can use 0x030F0000 to mean "3.15+" in e.g.:

    • PY_VERSION_HEX >= 0x030F0000
    • #define Py_LIMITED_API 0x030F0000
    • #define Py_TARGET_ABI3T 0x030F0000
  17. encukou
    added 2 commits that reference this issue on Jun 24, 2026

    gh-140550: Docs additions & fixups for PEP 793 (GH-151661)

    763cc22

    [3.15] gh-140550: Docs additions & fixups for PEP 793 (GH-151661) (GH…

    bc52a01
  18. vstinner
    added 2 commits that reference this issue on Sep 14, 2026

    pythongh-140550: Enable limited C API tests on Free Threading in test…

    3e76111

    pythongh-140550: Enable limited C API tests on Free Threading in test…

    9bed8d3
  19. encukou
    added a commit that references this issue on Sep 15, 2026

    pythongh-140550: Fix PyABIInfo_VAR macro: avoid ";"

    9435e20
  20. hugovk
    added 2 commits that reference this issue on Sep 15, 2026

    gh-140550: Fix PyABIInfo_VAR macro: avoid ";" (#157539)

    cbb43b8

    [3.15] gh-140550: Fix PyABIInfo_VAR macro: avoid ";" (#157494)

    4b6de96
  21. vstinner
    added a commit that references this issue on Sep 15, 2026

    gh-140550: Enable limited C API tests on Free Threading in test_cext (#…

    fb123c8
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