sub

gistfile1.py

#!/usr/bin/env python
# -*- coding: UTF-8 -*-

def subString(str, s, e):
    sPos = str.find(s)
    if sPos == -1:
        return None
    sLen = len(s)
    ePos = str.find(e, sPos + sLen)
    print sPos, ePos
    return str[sPos + sLen : ePos]

if __name__ == '__main__':
    str = u"Alt + F1 类似Windows下的Win键，在GNOME中打开应用程序菜单(Applications) "
    print type(str) 
    s = subString(str.encode("utf8"), u"类似".encode("utf8"), u"键".encode("utf8"))
    print s