pip已经安装，但是/usr/bin/pip: No such file or directory

https://blog.youkuaiyun.com/qq_15505637/article/details/81094162
解决方法

1.which pip
/usr/local/bin/pip

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

3.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.

pip在usr/local/bin/pip

如果机器上已经有之前的pip，要先卸载

sudo apt-get remove python-pip
wget https://bootstrap.pypa.io/get-pip.py
python get-pip.py
hash -r