pip 安装包时报错 /usr/bin/pip: No such file or directory

在ubuntu中使用pip报一下错误:
/usr/bin/pip: No such file or directory pip can no longer be found:

可以采用以下方式解决

• which pip
  /usr/local/bin/pip

• pip
  -su: /usr/bin/pip: No such file or directory

• 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 * question, the solution is very simple:

• hash -r
  When the cache is clear, pip is working again.

这样之后在进行操作，就可以使用pip了。