python的面向对象

# 班级每位同学自我介绍
# 1.字典遍历
# students={"name":"李柳","city":"北京"}
# for key in students:
#     print(key)

# for value in students.values():
#     print(value)

# for k,v in students.items():
#     print(k)
#     print(v)

# 2.建立类
# class Student():
#     # 初始化属性 ==构造函数
#     def __init__(self,name,city):
#         self.name=name
#         self.city=city
#         print("My name is ",name,",My city is",city)
#         print("My name is  %s and conme from %s" %(name,city))

#     def talk(self):
#         print("hello,everyone!")

# # 实例化对象
# st1 = Student('李柳','北京')
# # 对象调用方法
# st1.talk()

# 3.类的继承与多态
# class object:
#     def __init__(self,name):
#         self.name = name

class Animal(object): #Animal类继承object类

    def __init__(self,color):
        self.color = color

    def eat(self):
        print("动物在吃食物!")
    def run(self):
        print("动物在赛跑")

class Cat(Animal): #继承Animal类
    def  eat(self):
        print("猫在吃鱼!")

class Dog(Animal): #继承Animal类并定义自己的方法
    def __init__(self,name,age,color):
        super(Dog,self).__init__(color)
        self.name=name
        self.age=age

    def  eat(self):
        print("狗在啃骨头!")

cat= Cat("黑色")
cat.eat()
dog = Dog("小黑",30,"黑色")
dog.eat()
dog.run()
print(dog.color)

animal=Animal("黑色")
animal.eat()

# 多态
def feed(obj):
    obj.eat()

animal=Animal("黄色")
cat = Cat("蓝色")
dog=Dog("小黑",3,"黑色")

feed(cat)
feed(dog)
feed(animal)