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The None Object — Python v2.6.2 documentation

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.

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.

Properly handle returning Py_None from within a C function.

New in version 2.4.