错误信息:usr/bin/pip: No such file or directory

解决办法(一共四步，按照下面的步骤来从1到4，最后你会发现问题都解决了):

1.which pip /usr/local/bin/pip2.pip -su: /usr/bin/pip: No such file or directory3.type pip pip is hashed (/usr/bin/pip) So pip is definintely in /usr/local/bin/pip but it is been cached as in /usr/bin/pip, thanks to the Stackoverflow question, the solution is very simple:4.hash -r When the cache is clear, pip is working again.