How can I configure Geany to compile and run my Python programs?

Question

Under the Build menu, I can see 'Execute' option, but it is greyed out.

The only option available is 'Set Includes and Arguments'. When I click that both fields are already filled out. What do I have to write there?

Answer 1

For some unknown reason a new installed Geany at Ubuntu 19.04 (Disco Dingo) had python "%f" at Build → Set Build Commands → Execute default settings.

I solved a similar issue with python3 "%f" instead.