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,brand1,color1,ram1):
        self.brand = brand1
        self.color = color1
        self.ram = ram1
    def play_game(self,game):
        return '游戏名是：', game
    def write_code(self):
        return '正在写代码'
    def seevideo(self,):
        print('再看视屏')

print('=======通过对象点的⽅方式获取、修改、添加和删除它的属性======')

# 创建
computer1 = Computer('华硕','蓝色','8G')
# 获取
print(computer1.brand,computer1.color,computer1.ram)
# 修改
computer1.ram ='4G'
print(computer1.ram)
# 添加
computer1.price = '8000'
print(computer1.price)
# 删除
del computer1.color
print(computer1.brand,computer1.ram)

print('========通过attr相关⽅方法去获取、修改、添加和删除它的属性========')
# 创建
c1= Computer('华硕','蓝色','8G')
# 获取
a1 = getattr(c1,'brand','没有品牌记录')
print(a1)
# 修改
b1 = setattr(c1,'color','红色')
print(getattr(b1,'color','颜色'))
# 添加
c1= setattr(c1,'price',10000)
print(getattr(c1,'price','价格'))
# 删)
d1 = delattr(c1,'brand')
print(getattr(c1,'brand','品牌'))

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,name1,age1,dog1):
        self.name = name1
        self.age = age1
        self.dog = dog1
    def play_dog(self,dog):
        return self.name +'在遛一只叫'+ dog +'的狗'


class Dog:
    def __init__(self,dog_name,color1,dog_age):
        self.name1= dog_name
        self.color = color1
        self.age  = dog_age
    def cry_out(self):
        print('叫唤')

p1 = Person('小明',18,'二哈')
p1.play_dog('大黄')
print(p1.play_dog('大黄'))

3.声明⼀一个圆类，自己确定有哪些属性和方法

import math

class Circle:
    def __init__(self,r,d):
        self.r = r
        self.d = d
    def acreage(self,r):
        return math.pi*r**2
    def perimeter(self,r):
        return math.pi*r*2

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,name1,age1,id1):
        self.name = name1
        self.age = age1
        self.id = id1

    def answer(self):
        return self.name + '到'



class Class:
    def __init__(self,student,class_name):

        self.student = []
        self.class_name = class_name
#添加学⽣生
    def add_student(self,stu):
        self.student.append(stu)
#  删除学生
    def del_student(self,name):
        for index in range(len(self.student)):
            if self.student[index] == name:
                return self.student.pop(index)
# 点名
    def answer(self,name):
        for index in range(len(self.student)):
            if self.student[index] == name:
                return '到'

# 求班上学生的平均年龄
    def avg(self,age):
        count = 0
        for students in self.student:
            count += students.age
            return count / len(self.student)