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gh-134160: Split extension module init from PyModule docs; emphasize multi-phase init #135126

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@encukou encukou commented Jun 4, 2025

#134764 moved a section around; I don't think that's enough.


  • Split extension module init from PyModule docs; emphasize multi-phase init

    There's a difference between working with module objects in general
    (which just needs garden-variety API docs), and defining the init
    function (which covers things like correctly exporting a function
    defined by the user, and lots of behaviour that's unrelated to generic
    module objects).

  • Document behaviour of single-phase init. Call it "legacy".

  • Reorganize PyModule docs.

  • Move PyInit_modulename docs from the tutorial, and PyMODINIT_FUNC docs
    from the generic macros section, to the new page.

  • Add docs

  • Add doc stubs for PYTHON_API_VERSION & PYTHON_ABI_VERSION

  • Remove incorrect refcounts.dat entry for PyModuleDef_Init;
    instead note that the function sometimes returns a borrowed reference,
    sometimes as strong one.
    (IMO, it's best to pretend PyModuleDef isn't a PyObject at all,
    but, reference docs should be correct.)


📚 Documentation preview 📚: https://cpython-previews--135126.org.readthedocs.build/

…asize multi-phase init

Document behaviour of single-phase init. Call it "legacy".

Reorganize PyModule docs.

Move PyInit_modulename docs from the tutorial to reference documentation.

Move PyMODINIT_FUNC docs from generic macros to the new page.

Add doc stubs for `PYTHON_API_VERSION` & `PYTHON_ABI_VERSION`

Remove incorrect refcounts.dat entry for `PyModuleDef_Init`.
This removes the "Return value: Borrowed reference." note.
Instead, note that the function sometimes returns a borrowed reference,
sometimes as strong one.
(IMO, it's best to not think of `PyModuleDef` as a `PyObject` at all,
and act like it can't be reference-counted.)

Co-authored-by: Adam Turner <9087854+AA-Turner@users.noreply.github.com>
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@StanFromIreland StanFromIreland left a comment

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From a quick look, though I assume some are existing errors.

Co-authored-by: Stan Ulbrych <89152624+StanFromIreland@users.noreply.github.com>
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encukou commented Jun 5, 2025

Thank you!

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