Python的__file__实际上做了什么？

参见英文答案 > Is module __file__ attribute absolute or relative?4个
我一直认为__file__变量总是给你当前的文件名,但这似乎并不完全是它的作用.因为如果我认为这是真的,我一直面临着一个错误.

有人告诉我“__file__指的是最后搜索的模块”
这似乎更准确,但我想知道__file__应该做什么.

我找不到Python文档中提到的任何具体内容.
很多地方似乎都提到它,但不是很清楚.

http://docs.python.org/2/c-api/import.html?highlight=__file__

http://docs.python.org/2/c-api/module.html?highlight=__file__

解决方法

__file__ is the pathname of the file from which the module was loaded,if it was loaded from a file. The __file__ attribute is not present
 for C modules that are statically linked into the interpreter; for
 extension modules loaded dynamically from a shared library,it is the
 pathname of the shared library file.

从这里：
http://mail.python.org/pipermail/python-dev/2010-February/097461.html