Python raise - SyntaxError when running as an executable

Question

When I run my .py file from terminal I got no error, but when I run in as an executable (the exact same app) I get an error on this line

raise RuntimeError(f'Line lengths in the {file} are not ok. Please check it.')

When I comment it out it works. The error is: SyntaxError: invalid syntax pointing to the ' symbol at the end of the line. I do not understand how is it possible the file works without an error when running from terminal but not when run as executable.

Answer 1

Ok I am sorry - my stupid bad. When I was running the file from "terminal" - IDE used python 3.7.4 but when I run it as an (macOS) executable the default python command was using python 2.7.

So I just changed first line of the app to:

#!/usr/bin/env python3

Or one may also change alias for python.