文件操作 - none.rst.txt
返回文件管理
返回主菜单
删除本文件
文件: /usr/share/doc/python2-docs/html/_sources/c-api/none.rst.txt
编辑文件内容
.. 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. .. versionadded:: 2.4
修改文件时间
将文件时间修改为当前时间的前一年
删除文件