python 父类方法中使用不同的子类中的不同类对象

# coding:utf-8


class Animal(object):
    def __init__(self):
        self._name = None
        self._f = None

    def eat(self):
        print("%s吃%s" % (self._name, self._f().food()))


class Dog(Animal):
    def __init__(self):
        Animal.__init__(self)
        self._f = DogFood
        self._name = "狗"


class DogFood():
    def food(self):
        return "狗粮"


class Cat(Animal):
    def __init__(self):
        Animal.__init__(self)
        self._name = "猫"
        self._f = CatFood


class CatFood():
    def food(self):
        return "猫粮"


dog = Dog()
dog.eat()
cat = Cat()
cat.eat()

狗吃狗粮
猫吃猫粮

# coding:utf-8


class CatFood():
    def food(self, food_name):
        self.food_name = food_name

cf = CatFood

cf1 = CatFood()
cf1.food("鱼")
cf2 = CatFood()
cf2.food("粥")

print(cf1.food_name)
print(cf2.food_name)

鱼
粥

# coding:utf-8


class CatFood():
    def food(self, food_name):
        self.food_name = food_name

cf = CatFood

cf1 = CatFood()
cf1.food("鱼")
cf2 = CatFood()
cf2.food("粥")

print(CatFood)
print(cf)
print(cf1)

<class '__main__.CatFood'>
<class '__main__.CatFood'>
<__main__.CatFood object at 0x000000000279B320>

cf CatFood 是类对象

cf1是实例对象