Python source code

when running the command on the terminal, I was getting this error:

Rotimis-MacBook-Air:~ Rotimi$ python3 hello.py Guido

/Library/Frameworks/Python.framework/Versions/3.6/Resources/Python.app/Contents/MacOS/Python: can't open file 'hello.py': [Errno 2] No such file or directory

Rotimis-MacBook-Air:~ Rotimi$

What can I do in this case?