class Animal(object):
def eat(self):
print('动物会吃')
class Dog(Animal):
def eat(self):
print('Dogggggggg')
class Cat(Animal):
def eat(self):
print('Cattttttt')
class Person(Animal):
def eat(self):
print('Person')
####定义一个函数
def fun(obj):
obj.eat()
###开始调用函数
fun(Cat())
fun(Dog())
fun(Animal())
print('-------------')
fun(Person())
