# 三十一、多态
多态指的是一类事物有多种形态，比如动物有多种形态：猫、狗、猪
## 31.1 多态性
```python
class Animal:
def talk(self): # 动物共有的方法, 交流
print("%s 发出叫声" % self.__class__, end=": ")
class Cat(Animal): #动物的形态之一:猫
def talk(self):
super(Cat, self).talk()
print('喵喵喵。。。')
class Dog(Animal): #动物的形态之二:狗
def talk(self):
super(Dog, self).talk()
print("汪汪汪。。。")
class Pig(Animal): #动物的形态之三:猪
def talk(self):
super(Pig, self).talk()
print('哼哼哼。。。')
class People(Animal):
def talk(self):
super(People, self).talk()
print('嘤嘤嘤。。。')
animal1 = People()
animal2 = Dog()
animal3 = Pig()
animal4 = Cat()
animal1.talk()
animal2.talk()
animal3.talk()
animal4.talk()
def
