2.定义一个汽车类，并在类中定义一个move方法，然后分别创建BMW_X9、AUDI_A9对象，并添加颜色、马力、型号等属性，然后分别打印出属性值、调用move方法(使用init方法完成属性赋值)

下面是代码实现：

class Car:
    def __init__(self, color, horsepower, model):
        self.color = color
        self.horsepower = horsepower
        self.model = model

    def move(self):
        print(f"{self.model} is moving.")

BMW_X9 = Car("black", "350 hp", "BMW X9")
AUDI_A9 = Car("white", "400 hp", "AUDI A9")

print(f"BMW_X9: color={BMW_X9.color}, horsepower={BMW_X9.horsepower}, model={BMW_X9.model}")
BMW_X9.move()

print(f"AUDI_A9: color={AUDI_A9.color}, horsepower={AUDI_A9.horsepower}, model={AUDI_A9.model}")
AUDI_A9.move()

输出结果为：

BMW_X9: color=black, horsepower=350 hp, model=BMW X9
BMW X9 is moving.
AUDI_A9: color=white, horsepower=400 hp, model=AUDI A9
AUDI A9 is moving.