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eg：
class Car:
def __init__(self, newWheelNum, newColor):
self.wheelNum = newWheelNum
self.color = newColor
def __str__(self):
msg = "嘿。。。我的颜色是" + self.color + "我有" + self.wheelNum + "个轮胎..."
return msg
def move(self):
print('车在跑，目标:夏威夷')
hellocar = Car(4, "白色")
print(hellocar)
修改：
