外观模式

class Light(object):
    def on(self):
        print ‘light turn on‘
    def off(self):
        print ‘light turn off‘

class Screen(object):
    def on(self):
        print ‘screen turn on‘
    def off(self):
        print ‘screen turn off‘

class AirConditioner(object):
    def on(self):
        print ‘AirConditioner turn on‘
    def off(self):
        print ‘AirConditioner turn off‘

class TV(object):
    def on(self):
        print ‘TV turn on‘
    def off(self):
        print ‘TV turn off‘

class Facade(object):
    """description of class"""
    light=Light()
    screen=Screen()
    airconditioner = AirConditioner()
    tv=TV()
    def on(self):
        print ‘one key all on‘
        self.light.on()
        self.screen.on()
        self.airconditioner.on()
        self.tv.on()
        
    def off(self):
        print ‘one key all off‘
        self.light.off()
        self.screen.off()
        self.airconditioner.off()
        self.tv.off()

if __name__==‘__main__‘:
    facade=Facade()
    facade.on()
    facade.off()