gh-148325: Add PyObject_GetItemData() to the limited C API and stable ABI#148324
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wjakob wants to merge 1 commit intopython:mainfrom
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gh-148325: Add PyObject_GetItemData() to the limited C API and stable ABI#148324wjakob wants to merge 1 commit intopython:mainfrom
PyObject_GetItemData() to the limited C API and stable ABI#148324wjakob wants to merge 1 commit intopython:mainfrom
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wjakob
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…able ABI Move PyObject_GetItemData and PyObject_GetItemData_DuringGC from the unstable CPython API (Include/cpython/object.h) to the limited C API (Include/object.h), gated on Py_LIMITED_API >= 3.15, and declare them as part of the stable ABI in Misc/stable_abi.toml.
wjakob
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PyObject_GetItemData() to the limited C API and stable ABI
vstinner
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Apr 10, 2026
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LGTM.
The function is documented and tested by test_capi.test_misc (HeapCCollection tests and test_pyobject_getitemdata_error()).
| # Before 3.15, this was a macro that accessed the PyObject member | ||
| added = '3.15' | ||
| [function.PyObject_GetItemData] | ||
| # Before 3.15, this was only available in the unstable CPython API |
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nitpick: I'm not sure that this comment is useful, it's the case for most functions added to the stable ABI.
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| .. versionadded:: 3.12 | ||
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| .. versionchanged:: 3.15 |
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Suggested change
| .. versionchanged:: 3.15 | |
| .. versionchanged:: next |
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Python 3.15 feature freeze will occur at 3.15.0 beta 1, Tuesday, 2026-05-05. It should be doable. |
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I created capi-workgroup/decisions#103 decision issue for the C API Working Group. |
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This PR promotes
PyObject_GetItemData()andPyObject_GetItemData_DuringGC()to the stable ABI (analogous toPyObject_GetTypeData()andPyObject_GetTypeData_DuringGC()that are already in the stable ABI).The function
PyObject_GetItemData()is needed to access the entries of variable sized objects (PyVarObject).Why this change?
PyVarObjectbecomes opaque inabi3t.PyObject_GetItemData(), nanobind cannot run onabi3t.I am urgently (⚠️ ) trying to still get this into Python 3.15.
@vstinner @ngoldbaum @encukou
📚 Documentation preview 📚: https://cpython-previews--148324.org.readthedocs.build/