class Pedal:
    def __init__(self):
        self.상태 = False
    def press(self):
        if self.상태:
            return False
        else:
            self.상태 = True
            return True
class Engine:
    def __init__(self):
        self.상태 = False
    def powerUp(self):
        if self.상태:
            return False
        else:
            self.상태 = True
            return True
    def powerDown(self):
        if self.상태 is False:
            return False
        else:
            self.상태 = False
            return False
    def work(self):
        pass
class Wheel:
    def move(self):
        pass

class Car:
    def __init__(self, a,b,c,d):
        self.engine = Engine()
        self.pedal = Pedal()
        self.wheels = []
        for b in range(4):
            self.wheels.append(Wheel())
    def 시동걸다(self):
        self.engine.powerUp()
    def 움직이다(self):
        if(self.pedal.press()):
            while self.engine.work():
                for b in self.wheels:
                    b.move()

a=Car()
a.시동걸다()
a.움직이다()