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-bash: python: command not found

OS: Debian 9
Python: 3.5.3

Title error encountered when I add ' #! python3 ' in .py file as 1st line. Seems lost the path. As I installed python 3 already, so check its path with 'which' command:

peter@Debian:~$ which python3
/usr/bin/python3

Then replace it with absolute path '#! /usr/bin/python3'. Pass! 
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