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[docs] Mention how to get/set a bigint PyLong via the C API (GH-101270)

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We don't need direct C APIs to get at a bigint representation of PyLong but we
do want the few people who need to understand how.

Additional Author:  CAM-Gerlach
(cherry picked from commit e244401ce5)

Co-authored-by: Gregory P. Smith <greg@krypto.org>
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Miss Islington (bot) 2023-01-23 21:31:06 -08:00 • committed by GitHub
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@ -93,6 +93,10 @@ distinguished from a number. Use :c:func:`PyErr_Occurred` to disambiguate.
underscores after a base specifier and between digits are ignored. If there
are no digits, :exc:`ValueError` will be raised.
.. seealso:: Python methods :meth:`int.to_bytes` and :meth:`int.from_bytes`
to convert a :c:type:`PyLongObject` to/from an array of bytes in base
``256``. You can call those from C using :c:func:`PyObject_CallMethod`.
.. c:function:: PyObject* PyLong_FromUnicodeObject(PyObject *u, int base)