這是因為緩存的問題造成的，解決方案：
1.which pip
/usr/local/bin/pip

2.pip
-bash: /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.

https://blog.csdn.net/jiangjiang_jian/article/details/103770007

成功解決了自己的問題

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