python很多语法支持多态，多态的实现方法，实现接口重用
class Animal:
    def __init__(self,name):
        self.name=name

    def talk(self):
        pass

class Cat(Animal):
    def talk(self):
        print("%s Meow..."%self.name)

class Dog(Animal):
    def talk(self):
        print("%s Woof! woof!"%self.name)

d = Dog("chenronghua")
#d.talk()

c=Cat("xuliangwei")
#c.talk()

def animal_talk(obj):
    obj.talk()

animal_talk(c)
animal_talk(d)

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class Animal:
    def __init__(self,name):
        self.name=name

    def talk(self):
        pass

    @staticmethod #装饰器
    def animal_talk(obj):
        obj.talk()

class Cat(Animal):
    def talk(self):
        print("%s Meow..."%self.name)

class Dog(Animal):
    def talk(self):
        print("%s Woof! woof!"%self.name)

d = Dog("chenronghua")
#d.talk()

c=Cat("xuliangwei")
#c.talk()



Animal.animal_talk(c)
Animal.animal_talk(d)