Python/C API Reference Manual

7.1.2 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 handles returning Py_None from within a C function.

Python/C API Reference Manual

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Release 2.4c1, documentation updated on 18 November 2004.