Stuff

class Car(object):    __slots__ = ("color", "gastank", "engine")        def __init__(self):        self.color = "red"        self.gastank = Tank(100)        self.engine = Engine()class Engine(object):    __slots__ = ("horsepower")        def __init__(self):        horsepower = 9001class Tank(object):    __slots__ = ("percent_gas_remaining")        def __init__(self, percent_left):        self.percent_gas_remaining = percent_leftmyCar = Car()