1# 2# trafficLightDemo.py 3# 4# Example of a simple state machine modeling the state of a traffic light 5# 6 7import statemachine 8import trafficlightstate 9 10 11class TrafficLight(trafficlightstate.TrafficLightStateMixin): 12 def __init__(self): 13 self.initialize_state(trafficlightstate.Red) 14 15 def change(self): 16 self._state = self._state.next_state() 17 18 19light = TrafficLight() 20for i in range(10): 21 print("{0} {1}".format(light, ("STOP", "GO")[light.cars_can_go])) 22 light.crossing_signal() 23 light.delay() 24 print() 25 26 light.change() 27