The None Object
Note that the PyTypeObject for None is not directly exposed in the
Python/C API. Since None is a singleton, testing for object identity (using
== in C) is sufficient. There is no PyNone_Check() function for the
same reason.
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PyObject* Py_None
The Python None object, denoting lack of value. This object has no methods.
It needs to be treated just like any other object with respect to reference
counts.
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Py_RETURN_NONE
Properly handle returning Py_None from within a C function.
New in version 2.4.
