概述
封装
1 # 2 # @author：浊浪 3 # @version：0.1 4 # @time： 2021/4/16 9:13 5 # 6 7 class Student: 8 def __init__(self, name, age): 9 self.name = name 10 self.__age = age 11 def show(self): 12 print(self.name, self.__age) 13 14 15 stu = Student('张三', 20) 16 stu.show() 17 18 # 在类的外部调用属性 19 print(stu.name) 20 # print(stu.__age) #AttributeError: 'Student' object has no attribute '__age' 21 22 print(dir(stu)) # 查看所有的属性和方法 23 print(stu._Student__age) # 在类的外部也可以使用
继承
1 # 2 # @author：浊浪 3 # @version：0.1 4 # @time： 2021/4/16 9:31 5 # 6 7 class Person(object): 8 def __init__(self, name, age): 9 self.name = name 10 self.age = age 11 def info(self): 12 print(self.name, self.age) 13 14 class Student(Person): 15 def __init__(self,name, age, stu_no): 16 super().__init__(name, age) 17 self.stu_no = stu_no 18 19 class Teacher(Person): 20 def __init__(self,name, age, tea_y): 21 super(Teacher, self).__init__(name, age) 22 self.tea_y = tea_y 23 24 stu = Student('张三', 18, 20001) 25 tea = Teacher('李四', 40, 18) 26 stu.info() 27 tea.info()
方法重写
objec类
多态
1 # 2 # @author：浊浪 3 # @version：0.1 4 # @time： 2021/4/16 10:46 5 # 6 7 class Animal(object): 8 def eat(self): 9 print('动物吃。。。') 10 11 class Dog(Animal): 12 def eat(self): 13 print('狗吃肉。。。') 14 15 class Cat(Animal): 16 def eat(self): 17 print('猫吃鱼。。。') 18 19 class Person(object): 20 def eat(self): 21 print('人吃很多东西。。') 22 23 24 25 # 定义一个函数 26 27 def fun(obj): 28 obj.eat() 29 30 fun(Cat()) 31 fun(Dog()) 32 fun(Animal()) 33 print('----------------------') 34 fun(Person())
