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(python2.1-api.info)None Object

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The None Object
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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.