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#
# trafficLightDemo.py
#
# Example of a simple state machine modeling the state of a traffic light
#
import statemachine
import trafficlightstate
class TrafficLight:
def __init__(self):
# start light in Red state
self._state = trafficlightstate.Red()
def change(self):
self._state = self._state.next_state()
# get light behavior/properties from current state
def __getattr__(self, attrname):
return getattr(self._state, attrname)
def __str__(self):
return "{}: {}".format(self.__class__.__name__, self._state)
light = TrafficLight()
for i in range(10):
print("{} {}".format(light, ("STOP", "GO")[light.cars_can_go]))
light.crossing_signal()
light.delay()
print()
light.change()
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