symbian-qemu-0.9.1-12/python-2.6.1/Doc/c-api/none.rst
author Gareth Stockwell <gareth.stockwell@accenture.com>
Fri, 24 Sep 2010 13:44:00 +0100
branchgraphics-phase-3
changeset 117 b7d35cad610d
parent 1 2fb8b9db1c86
permissions -rw-r--r--
Modified path to qemu package source to /sf/adapt/qemu This is to conform with the convention that adaptation-level packages should be located in /sf/adapt rather than /sf/adaptation. This is an interim workaround for bug 3744.

.. highlightlang:: c

.. _noneobject:

The None Object
---------------

.. index:: object: None

Note that the :ctype:`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 :cfunc:`PyNone_Check` function for the
same reason.


.. cvar:: 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.


.. cmacro:: Py_RETURN_NONE

   Properly handle returning :cdata:`Py_None` from within a C function.

   .. versionadded:: 2.4