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# here import statements
# and constants definitions


def init_rpio():
    # set init states here
    pass
    
    
def get_direction():
    # return next direction or 0
    return 0
    
    
def get_button_event():
    # gets information about pressed buttons
    # and returns an according result
  
  
def main_control():
    while True:
        direction = get_direction() 
        button_event = get_button_event()
        # depending on direction and button_event
        # call:
        #   handler()
        # or:
        #   another_handler()
        # and so on.


# entry point
def main():
    try:
        main_control()
    except KeyboardInterrupt:
        pass


# global call, so module can run standalone or get imported somewhere else.
init_rpio()


if __name__ == '__main__':
    main()