day12作业

1. 声明⼀个电脑类: 属性:品牌、颜⾊、内存⼤小 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方式获取、修改、添加和删除它的属性
   b.通过attr相关⽅方法去获取、修改、添加和删除它的属性

   class Computer:
       def __init__(self, brand, color='black', size='16G'):
           self.brand = brand
           self.color = color
           self.size = size
   
       def play(self):
           print('play')
   
       def coding(self):
           print('coding')
   
       def mv(self):
           print('mv')
   
   
   # a.
   c1 = Computer('华为')
   print(c1.brand)
   c1.brand = 'apple'
   c1.screen = '14'
   del c1.screen
   # b.
   getattr(c1, 'brand')
   setattr(c1, 'size', '32G')
   setattr(c1, 'screen', '14')
   delattr(c1, 'screen')
   

   ​

2. 声明⼀个人的类和狗的类:

   狗的属性:名字、颜⾊色、年年龄
   狗的⽅方法:叫唤
   人的属性:名字、年年龄、狗
   人的⽅方法:遛狗
   a.创建⼈人的对象⼩小明，让他拥有⼀一条狗⼤大⻩黄，然后让⼩小明去遛⼤大⻩黄

   class Person:
       def __init__(self, name, age, dog):
           self.name = name
           self.age = age
           self.dog = dog
   
       def dogging(self):
           print('遛狗：', self.dog)
   
   
   class Dog:
       def __init__(self, name, color, age):
           self.name = name
           self.age = age
           self.color = color
   
       def bark(self):
           print('叫唤')
   
   
   d1 = Dog('大黄', '黄色', 2)
   p1 = Person('小明', '20', d1.name)
   p1.dogging()
   

   ​

3. 声明⼀一个圆类，自己确定有哪些属性和方法

   class Circle:
       pi = 3.1415926
   
       def __init__(self, r):
           self.r = r
   
       def area(self):
           print('圆的面积：', self.pi * self.r ** 2)
   
   
   c1 = Circle(2)
   c1.area()
   

   ​

4. 创建⼀一个学⽣生类:

   属性:姓名，年龄，学号
   方法:答到，展示学⽣生信息

   创建⼀一个班级类:
   属性:学⽣生，班级名
   方法:添加学⽣生，删除学生，点名, 求班上学生的平均年龄

   class Student:
   
       def __init__(self, name, age, sid):
           self.name = name
           self.age = age
           self.sid = sid
   
       def answer(self):
           print('答到：', self.name)
   
       def msg(self):
           print('学生信息：', self.name, self.age, self.sid)
   
   
   """
   class_name = [
       {'sname':sname,'age':age,'sid':sid}
   ]
   """
   
   
   class Clazz:
   
       def __init__(self, name: str):
           self.name = name
           self.stus = []
   
       def add(self, stu):
           self.stus.append(stu)
   
       def _delete(self,stu):
           self.stus.remove(stu)
   
       def check(self):
           for stu in self.stus:
               yield stu['name']
   
       def avg(self):
           sum1 = 0
           for stu in self.stus:
               sum1 += stu['age']
           avg = sum1 / len(self.stus)
           return avg
   
   
   s1 = Student('1', 20, '001')
   s2 = Student('2', 28, '002')
   c1 = Clazz('c1')
   c1.add(s1.__dict__)
   c1.add(s2.__dict__)
   print(c1.stus)
   print(c1.avg())