example.py

if __name__ == "__main__":
    # The Client is the main python app

    # The Light is the Reciever
    LIGHT = Light()

    # Create Commands
    SWITCH_ON = SwitchOnCommand(LIGHT)
    SWITCH_OFF = SwitchOffCommand(LIGHT)

    # Register the commands with the invoker (Switch)
    SWITCH = Switch()
    SWITCH.register("ON", SWITCH_ON)
    SWITCH.register("OFF", SWITCH_OFF)

    # Execute the commands that are registered on the Invoker
    SWITCH.execute("ON")
    SWITCH.execute("OFF")
    SWITCH.execute("ON")
    SWITCH.execute("OFF")

    # For fun, we can see the history
    print(SWITCH.history)