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The None Object — Python 2.7.5 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.

Py_RETURN_NONE¶

Properly handle returning Py_None from within a C function.

New in version 2.4.

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