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 Stackoverflow 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。