面向对象 第三部分 继承和多态

class Animal(object):
    def run(self):
        print('Animal is running...')
class Dog(Animal):
    def run(self):# 继承的好处：多态
        print('Dog is running...')
    def eat(self):
        print('Eating meat...')
class Cat(Animal):
    def run(self):
        print('Cat is running...')
# 实例化dog
dog= Dog()
dog.run()
# 实例化cat
cat= Cat()
cat.run()

# 判断类型
a=list() # a是list类型
b=Animal()# b是Animal类型
c=Dog()# c是Dog类型
result1=isinstance(c,Dog)
print(result1)
result2=isinstance(c,Animal)#  c属于dog，也属于父类
print(result2)