While loop question

[nilamo]

Your e.g. windows app ("object-oriented"), sits there and does nothing until you press a button. My device with python always wants to halt, i have to explicitely keep it running with a while loop. Hardware buttons don't behave like software buttons :-)

Hardware is always there.  Software runs until it's done, then stops.  There's no such thing as software that does nothing until something happens.  The "does nothing" step IS a while loop.  That's the only construct available.  Even if somehow the button had a kernel module that caused an Interrupt Signal to be sent out, so your program could respond immediately to the button press... it'd still be sitting within a while True loop.  Otherwise, the program would reach the end, and stop.  And if it stops, then it can't still be around to respond to events.