Document _PyObject_GetDictPtr (#13)

Author: encukou

Doc/c-api/object.rst

@@ -137,6 +137,16 @@ Object Protocol
    .. versionadded:: 3.3
 
 
+.. c:function:: PyObject** _PyObject_GetDictPtr(PyObject *obj)
+
+   Return a pointer to :py:attr:`~object.__dict__` of the object *obj*.
+   If there is no ``__dict__``, return ``NULL`` without setting an exception.
+
+   Calling this function` may need to allocate memory for the
+   dictionary, so it is may be more efficient to call :c:func:`PyObject_GetAttr`
+   when accessing an attribute on the object.
+
+
 .. c:function:: PyObject* PyObject_RichCompare(PyObject *o1, PyObject *o2, int opid)
 
    Compare the values of *o1* and *o2* using the operation specified by *opid*,