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# define state machine
statemachine TrafficLight:
Red -> Green
Green -> Yellow
Yellow -> Red
# define some class level constants
Red.carsCanGo = False
Yellow.carsCanGo = True
Green.carsCanGo = True
# setup some class level methods
def flashCrosswalk(s):
def flash():
print("%s...%s...%s" % (s, s, s))
return flash
Red.crossingSignal = staticmethod(flashCrosswalk("WALK"))
Yellow.crossingSignal = staticmethod(flashCrosswalk("DONT WALK"))
Green.crossingSignal = staticmethod(flashCrosswalk("DONT WALK"))
# setup some instance methods
def wait(nSeconds):
def waitFn(self):
print("<wait %d seconds>" % nSeconds)
return waitFn
Red.delay = wait(20)
Yellow.delay = wait(3)
Green.delay = wait(15)
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