好，python可执行文件中有一个-s标志，用于禁止搜索用户站点目录(`〜/.local/lib/python2.7/site -包装等).那解决了上面的问题！

Well, there is a -s flag in python executable to disable searching the user site directory (`~/.local/lib/python2.7/site-packages etc). That solves the problem above!