for linux,明明有安裝python3了,怎麼會還出現「/usr/bin/env: ‘python’: No such file or directory」錯誤訊息無法執行.py檔呢?

明明有安裝python3了,怎麼會還出現「/usr/bin/env: ‘python’: No such file or directory」錯誤訊息無法執行.py檔呢?
很多人有很多種做法,我是用這式方
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You can try the command line tool update-alternatives.

$ sudo update-alternatives --config python

If you get the error "no alternatives for python" then set up an alternative yourself with the following command:

$ sudo update-alternatives --install /usr/bin/python python /usr/bin/python3 10

Change the path /usr/bin/python3 to your desired python version accordingly.
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來源參考這裡 的最終一PO

就將,一起加油吧