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bpo-5945: mapping.rst: PyMapping_Check(list) returns 1 #144

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5 changes: 3 additions & 2 deletions Doc/c-api/mapping.rst
Original file line number Diff line number Diff line change
Expand Up @@ -8,8 +8,9 @@ Mapping Protocol

.. c:function:: int PyMapping_Check(PyObject *o)

Return ``1`` if the object provides mapping protocol, and ``0`` otherwise. This
function always succeeds.
**Not recommended.** Return ``1`` if the object provides the C-API mapping
protocol, and ``0`` otherwise. This function always succeeds. PyMapping_Check()
also returns 1 for sequences that support slicing.


.. c:function:: Py_ssize_t PyMapping_Size(PyObject *o)
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