Function to Stop Program

[dani0716]

Is there a function that stop the program even if its in the middle of the program? I've tried 'Systemexit()' however this doesn't do anything and I've tried 'raise systemexit' which works but it also writes 'traceback ...' after in the terminal (I know I'm being picky here). Is there a way to like after a if statement do like 'if len(input) != 2: ,,,stop the program'''

[laurensvalk]

While there is nothing wrong with a system exit, here is how you can catch it and run some clean up code. This could be to say something nice instead of the traceback, or to return motors to a starting position for example before properly exiting.

from pybricks.tools import wait

def main_program():
    print("For a moment, nothing happened.")
    wait(10000)
    print("Then, after 10 seconds or so, nothing continued to happen.")

try:
    main_program()
except SystemExit:
    print("So long, and thanks for all the fish!")

Try letting it exit normally, and then try it by pressing the button (or add raise SystemExit anywhere in main_program such as when len(input) != 2. You should see a different ending message.