Determine whether program was started by clicking icon or command line

[Benjamin Hell]

Hi!

I wonder whether there might be a way to find out how a Python
program was started (in my case in Windows): By double clicking the
file or by calling it on the "DOS" command line prompt.

Background: I would like to have the program run in an "interactive
mode" if double clicked, and silently in a "batch mode" when started
otherwise.

Any hints?

Thank you!

Ben