Python/C API Reference Manual

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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 handle returning Py_None from within a C function. New in version 2.4.

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Python/C API Reference Manual

Previous: 7.1.1 Type Objects Up: 7.1 Fundamental Objects Next: 7.2 Numeric Objects

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Release 2.5.4, documentation updated on 23rd December, 2008.