0.定义一个学生类。有属性：姓名、年龄、成绩（语文，数学，英语)[每课成绩的类型为整数]
方法： a. 获取学生的姓名：getname() b. 获取学生的年龄：getage()
c. 返回3门科目中最高的分数。get_course()

• class Students :
      def __init__(self, stu_name, stu_age, chinese_score, math_score, english_score):
          self.stu_name = stu_name
          self.stu_age = stu_age
          self.chinese_score = chinese_score
          self.math_score = math_score
          self.english_score = english_score
      def max_score(self):
          return max(self.chinese_score,self.math_score,self.english_score)
  stu1 = Students('小明',19,90,10,60)class Computer:
  

  • """电脑类"""
     def __init__(self, brand='联想', color='黑色', memory=0):
       self.brand = brand
       self.color = color
       self.memory = memory
    
      @staticmethod
      def play_game(game):
          print('玩儿%s' % game)
    
    @staticmethod
       def code():
           print('写python代码')
    
      @staticmethod
      def watch_video(video):
          print('在看%s' % video)
    
    
     com1 = Computer(memory=512)
     # 查
     print(com1.color)
     print(getattr(com1, 'color', '白色'))
     # 改
     com1.brand = '戴尔'
     setattr(com1, 'brand', '华硕')
     # 增
     # com1.size = 13.5
        setattr(com1, 'size', 15)
        print(com1.size)
        # 删
        del com1.size
        delattr(com1, 'memory')
    

    =====================2.人和狗====================

     class Dog:
      """狗"""
      def __init__(self, name1='', color1='', age1=0):
          self.name = name1
          self.color = color1
          self.age = age1
    
      def shout(self):
          print('%s在汪汪叫!' % self.name)
    
    
         class Person:
          """人"""
          def __init__(self, name='', age=0):
                  self.name = name
              self.age = age
          self.dog = None   # dog属性的值必须是Dog类的对象
    
    def took_dog(self):
        # 能遛狗的前提是自己有狗
        if not self.dog:
            print('没有🐶~溜自己吧！')
            return
        print('%s牵着%s在玩儿~' % (self.name, self.dog.name))
    
    
      p1 = Person('小明')
      p1.age = 18
      p1.dog = Dog('大黄', '黄色', 2)
      p1.took_dog()
    
    
          # ===================3.学生和班级================
      class Student:
          """学生"""
          def __init__(self, name, age=0, id=''):
          self.name = name
          self.age = age
          self.id = id
    
          def response(self):
                  """答到"""
              print('%s,到！' % self.name)
    
        def show_info(self):
            print('姓名:%s 年龄:%d 学号:%s' % (self.name, self.age, self.id))
    
    
    class Class:
     """班级"""
      def __init__(self, name):
          self.students = []  # 这个列表的元素是学生对象
        self.name = name
        self.__count = 0
    
    def add_student(self):
            """添加学生"""
        name = input('姓名:')
        age = input('年龄:')
        # 学号
        self.__count += 1
        id = 'stu' + str(self.__count).rjust(3, '0')
    
    # 创建学生对象
    stu = Student(name, int(age), id)
    
    # 将学生保存到班级中
    self.students.append(stu)
    
    def del_student(self):
    """删除学生"""
    del_name = input('请输入要删除的学生名字:')
    
    is_del = False
    # 遍历列表拿到的是学生对象
    for stu in self.students[:]:
        if stu.name == del_name:
            self.students.remove(stu)
            print('删除成功!')
            is_del = True
    
    if not is_del:
        print('没有该学生！')
    
    def call_names(self):
            """点名"""
    for stu in self.students:
        print(stu.name)
        stu.response()
    
    
      class1 = Class('python1806')
      # 添加学生
      for _ in range(5):
    class1.add_student()
      # 删除学生
      class1.del_student()
      # 点名
      class1.call_names()
    

    =====================4.数学类========================

     class Math:
      pi = 3.14159265358
      e = 2.7
    
       @staticmethod
       def sum_double(num1, num2):
           return num1 + num2
    
    @classmethod
    def circle_area(cls, r):
        return cls.pi * r**2