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gh-141226: Deprecate PEP-456 support for embedders #141287

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Merged
picnixz merged 5 commits into from
Feb 21, 2026
Merged

gh-141226: Deprecate PEP-456 support for embedders #141287

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46bd556
Deprecate PEP 456 support for embedders
picnixz Nov 9, 2025
8d1ff1c
Merge branch 'main' into feat/deprecate/external-141226
picnixz Feb 7, 2026
bc00153
defer removal to Python 3.19
picnixz Feb 7, 2026
07e32b0
fixup
picnixz Feb 7, 2026
077d808
move deprecation notice under the C API section instead
picnixz Feb 7, 2026
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move deprecation notice under the C API section instead
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@picnixz
picnixz committed Feb 7, 2026
commit 077d808d1977c5512a5c3162926e2e98ad5527ea
22 changes: 10 additions & 12 deletions Doc/whatsnew/3.15.rst
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Expand Up @@ -1310,18 +1310,6 @@ Deprecated
New deprecations
----------------

* Build:

* Deprecate :pep:`456` support for providing an external definition
of the string hashing scheme. Removal is scheduled for Python 3.19.

Previously, embedders could define :c:macro:`Py_HASH_ALGORITHM` to be
``Py_HASH_EXTERNAL`` to indicate that the hashing scheme was provided
externally but this feature was undocumented, untested and most likely
unused.

(Contributed by Bénédikt Tran in :gh:`141226`.)

* :mod:`base64`:

* Accepting the ``+`` and ``/`` characters with an alternative alphabet in
Expand Down Expand Up @@ -1550,6 +1538,16 @@ on Python 3.13 and older.
Deprecated C APIs
-----------------

* Deprecate :pep:`456` support for providing an external definition
of the string hashing scheme. Removal is scheduled for Python 3.19.

Previously, embedders could define :c:macro:`Py_HASH_ALGORITHM` to be
``Py_HASH_EXTERNAL`` to indicate that the hashing scheme was provided
externally but this feature was undocumented, untested and most likely
unused.

(Contributed by Bénédikt Tran in :gh:`141226`.)

* For unsigned integer formats in :c:func:`PyArg_ParseTuple`,
accepting Python integers with value that is larger than the maximal value
for the C type or less than the minimal value for the corresponding
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