1.声明 个电脑类: 属性:品牌、颜色 、内存方法:打游戏、写代码、看视频;

a.创建电脑类的对象，然后通过对象点的方式获取、修改、添加和删除它的属性
b.通过attr相关 法去获取、修改、添加和删除它的属性

• class Computer:
      def __init__(self, brand, color, ram):
          self.brand = brand
          self.color = color
          self.ram = ram
      def paly_computegame(self):
          print('打游戏')
      def write_code (self):
          print('打游戏')
      def watch_video(self):
          print('看视频')
  
  computer1 = Computer(brand='dell', color='black',ram = 2048)
  

• #查看
  print(computer1.ram)
  getattr(computer1, 'ram', 0)
  
  # 增加
  computer1.cpu = 'i5'
  setattr(computer1, 'graphics card', 'gta950')
  
  # 删除
  del computer1.brand
  delattr(computer1, 'brand')
  
  computer1.brand = 'lever'
  setattr(computer1, 'color' 'yellow')
  

2.声明⼀个⼈的类和狗的类：

狗的属性：名字、颜⾊、年龄 狗的⽅法：叫唤
⼈的属性：名字、年龄、狗 ⼈的⽅法：遛狗
a.创建⼈的对象⼩明，让他拥有⼀条狗⼤⻩，然后让⼩明去遛⼤⻩

• class Dog:
        def __init__(self,name,color,age):
          self.name = name
          self.color = color
          self.age= age
      def dog_call(self):
          return '汪~'
  
  dog1 = Dog(name='大黄', color='yellow', age= 1)
  
  class Person:
      def __init__(self, name,age,dog):
          self.name = name
          self.age = age
          self.age = dog
      def walk_dog(self):
         return dog1.dog_call()
  
  p1 = Person(name='小明', age=18 , dog=dog1)
  
  print(p1.walk_dog())
  

3.声明⼀个矩形类：

属性：⻓、宽 ⽅法：计算周⻓和⾯积
a.创建不同的矩形，并且打印其周⻓和⾯积

• class Rectangle :
      def __init__(self,long,wide):
          self.long = long
          self.wide = wide
      def perimeter_area (self):
          return (self.long+self.wide *2),self.long*self.wide
  jx1 = Rectangle(2,3)
  print(jx1.perimeter_area())