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gh-104922: Doc: extending: add note about PY_SSIZE_T_CLEAN #106314

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Merged
methane merged 2 commits into from
Jul 2, 2023
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gh-104922: Doc: extending: add note about PY_SSIZE_T_CLEAN #106314

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Doc: extending: add note about PY_SSIZE_T_CLEAN
methane Jul 1, 2023
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Add note about PY_SSIZE_T_CLEAN in embedding.rst
methane Jul 2, 2023
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Doc: extending: add note about PY_SSIZE_T_CLEAN
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@methane
methane committed Jul 1, 2023
commit ce9c44078c5f7cc21fc4cb2b5efa0df444ff8cd9
6 changes: 4 additions & 2 deletions Doc/extending/extending.rst
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Expand Up @@ -69,8 +69,10 @@ the module and a copyright notice if you like).
headers on some systems, you *must* include :file:`Python.h` before any standard
headers are included.

It is recommended to always define ``PY_SSIZE_T_CLEAN`` before including
``Python.h``. See :ref:`arg-parsing-string-and-buffers` for a description of this macro.
``#define PY_SSIZE_T_CLEAN`` was used to indicate that ``Py_ssize_t`` should be
used in some APIs instead of ``int``.
It is not necessary since Python 3.13, but we keep it here for backward compatibility.
See :ref:`arg-parsing-string-and-buffers` for a description of this macro.

All user-visible symbols defined by :file:`Python.h` have a prefix of ``Py`` or
``PY``, except those defined in standard header files. For convenience, and
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