What should one pass to sys.exit

I'm not sure if this is an appropriate question for stack overflow... If not please guide me in the right direction.

My question is this:
If a programe expects a user to press ctrl-c to close/interrupt said program and return the user to there shell and the programe does this by handling the KeyboardInterupt by calling sys.exit(code) what should code be. I think said program should call sys.exit(0) because it was antisapatin the user of said programme to eventually mash ctrl-c to close the programe, not because of it hanging or crashing but because its know longer needed.