cpython/Doc/c-api/none.rst

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.. highlight:: c
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.. _noneobject:
The ``None`` Object
-------------------
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.. index:: object: None
Note that the :c:type:`PyTypeObject` for ``None`` is not directly exposed in the
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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
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same reason.
.. c:var:: PyObject* Py_None
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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
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Properly handle returning :c:data:`Py_None` from within a C function (that is,
increment the reference count of ``None`` and return it.)