Showing content from http://svn.python.org/projects/python/branches/test_subprocess_10826/Doc/c-api/none.rst below:
.. highlightlang:: c .. _noneobject: The None Object --------------- .. index:: object: None Note that the :c:type:`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 :c:func:`PyNone_Check` function for the same reason. .. c:var:: 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. .. c:macro:: Py_RETURN_NONE Properly handle returning :c:data:`Py_None` from within a C function (that is, increment the reference count of None and return it.)
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