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gh-141226: Deprecate PEP-456 support for embedders#141287
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picnixz merged 5 commits intoFeb 21, 2026
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I'm +1 on deprecating this feature. I have no opinion on which release should remove the code.
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Deprecate PEP-456 [1] support for providing an external definition of the string hashing scheme. Removal is scheduled for Python 3.19. Previously, embedders could define the ``Py_HASH_ALGORITHM`` macro to be ``Py_HASH_EXTERNAL`` [2] to indicate that the hashing scheme was provided externally but this feature was undocumented, untested and most likely unused. [1]: https://peps.python.org/pep-0456/ [2]: https://peps.python.org/pep-0456/#hash-function-selection
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Deprecate PEP-456 [1] support for providing an external definition of the string hashing scheme. Removal is scheduled for Python 3.19. Previously, embedders could define the ``Py_HASH_ALGORITHM`` macro to be ``Py_HASH_EXTERNAL`` [2] to indicate that the hashing scheme was provided externally but this feature was undocumented, untested and most likely unused. [1]: https://peps.python.org/pep-0456/ [2]: https://peps.python.org/pep-0456/#hash-function-selection
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--with-hash-algorithm#141226📚 Documentation preview 📚: https://cpython-previews--141287.org.readthedocs.build/