三大特性之多态

class H20:
    def __init__(self,name,temerature):
        self.name = name
        self.temerature = temerature
    def turn_ice(self):
        if self.temerature < 0:
            print("[%s]温度太低结冰了"%self.name)
        elif self.temerature > 0 and self.temerature < 100:
            print("[%s]液化成水" % self.name)
        elif self.temerature > 100:
            print("[%s]温度太高变成水蒸气" % self.name)
class Water(H20):
    pass
class Ice(H20):
    pass
class Steam(H20):
    pass
w1 = Water("水",25)
i1 = Ice("冰",-20)
s1 = Steam("水蒸气",3000)
w1.turn_ice() #执行过程中不同的对象调用相同的方法
i1.turn_ice()
s1.turn_ice()
#或者定义一个接口来执行上面的调用
def func(obj):
    obj.turn_ice()
func(w1)
func(i1)
func(s1)