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,types,color,internal = '256GB'):
        self.types = types
        self.color = color
        self.internal = internal

    def play_game(self):
        print('play_game')
    def write_code(self):
        print('write code')
    def see_film(self):
        print('see film')

computer = Computer('Lenovo','black')
print(computer.types,computer.color,computer.internal)
computer.types = 'ASUS'
computer.color = 'blue'
computer.internal = '512GB'
computer.size = '16英寸'
del computer.types
print(getattr(computer,'color'))
print(setattr(computer,'color','green'))
print(setattr(computer,'types','Lenovo'))
delattr(computer,'types')

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

class Person:
    def __init__(self,name,age,dog):
        self.name =name
        self.age =age
        self.dog =dog

    def walk_dog(self):
        if self.dog:
              print('%s遛%s'%(self.name,self.dog.name))
        else:
              print('你还是只单身狗')

class Dog:
    def __init__(self,name,color,age):
        self.name =name
        self.color =color
        self.age = age

    def call_out(self):
        print('%s叫唤'%self.name)


dog1 = Dog('小小','white',3)
person1= Person('习**','40',dog1)

person1.walk_dog()
dog1.call_out()

3.声明⼀一个圆类，自己确定有哪些属性和方法

class Circle:
    pi = 3.141592653
    def __init__(self,radius):
        self.radius = radius
        

    def area(self):
        return (Circle.pi*self.radius**2)

    def perimeter(self):
        return (2*Cricle.pi*self.radius)

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:
    dict1 ={}
    def __init__(self,name,age,code):
        self.name = name
        self.age = age
        self.code = code
        Student.dict1['name'] =name
        Student.dict1['age'] = age
        Student.dict1['code'] = code


    def daying(self):
        print('到！！name:%s,age:%scode:%s'%(self.name,self.age,self.code))
class Class:
    dict2 = {}
    table = []
    def __init__(self,student,classs):
        self.student =student
        self.classs = classs
#
    def add_stu(self):
        if  self.classs  not in   Class.dict2.keys():
                Class.table=[]
        a = self.student.copy()
        Class.table.append(a)
        Class.dict2[self.classs] =  Class.table
        print(Class.dict2)
#
    def del_stu(self,code,classs):
        for i in Class.dict2[classs]:
            if i['code']==code:
                del i

#
    def ask(self,code):
        for i in Class.dict2[self.classs]:
            if i['code']==code:
                c = Student(i['name'],i['age'],i['code'])
                c.daying()


    def average(self):
        a =0
        for i in Class.dict2[self.classs]:
            a+=int(i['age'])
        b = a //len(Class.dict2[self.classs])
        print(b)

s1=Student('小明','12','001')
c1=Class(s1.dict1,'classs1')
c1.add_stu()
s2 =Student('小花','16','002')
c1.ask('001')
c1.add_stu()
c1.average()