mirror of
https://github.com/python/cpython.git
synced 2024-12-01 03:01:36 +01:00
27 lines
723 B
ReStructuredText
27 lines
723 B
ReStructuredText
|
.. 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 (that is,
|
||
|
|
increment the reference count of None and return it.)
|