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:
    """类型说明: """
    def __init__(self, brand, color, ram):
        self.brand = brand
        self.color = color
        self.ram = ram
    def method(self, method):
        print(self.brand, method)

computer = Computer('联想', '红色', '8G DDR4 3000Hmz')
computer.method('打游戏')

print(computer.brand)
print('===========attr方法============')
print(getattr(computer, 'brand'))

computer.brand = 'ROG'
print(computer.brand)
print('===========attr方法============')
setattr(computer, 'brand', 'ROG')
print(computer.brand)

computer.ROM = '1T'
print(computer.ROM)
print('===========attr方法============')
setattr(computer, 'DVD', '光驱')
print(computer.DVD)

# del computer.ROM
# print(computer.ROM) AttributeError: 'Computer' object has no attribute 'ROM'
# print('===========attr方法============')
# # delattr(computer, 'DVD')
# print(computer.DVD) AttributeError: 'Computer' object has no attribute 'DVD'

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:
    """声明人的名字、年龄、狗"""
    def __init__(self, name, age, dog):
        self.name = name
        self.age = age
        self.dog = dog
    def method(self, method='遛'):
        print(self.name + method + self.dog)


class Dog:
    """声明狗的名字、颜色、年龄"""
    def __init__(self, name, color, age):
        self.name = name
        self.color = color
        self.age = age
    def method(self, method='汪汪汪'):
        print(self.name + method)


person = Person('小米', '22', '哈士奇')
person.method()
print(person)

3.声明一个圆类，自己确定有哪些属性和方法

import math

class Circle:
    def __init__(self):
        pass
    def method(self, r):
        self.perimeter = 2 * math.pi * r
        self.area = math.pi * r

a = Circle()
a.method(3)
print(a.perimeter)
print(a.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

import random
all_student = []


class Student:
    """属性:姓名，年龄，学号"""
    def __init__(self, name, age, classroom):
        self.name = name
        self.age = age
        self.classroom = classroom
        self.dadao = random.randint(0, 1)
        all_student.append({'name': self.name, 'age': self.age, 'classroom': self.classroom, 'dadao': self.dadao})
    def method(self, name):
        for i in all_student:
            if i['name'] == name:
                if i['dadao'] == True:
                    print(i, '到')
            else:
                print(i, '缺勤')


a = Student('刘畅', '19', '001')
b = Student('刘畅1', '29', '002')
a.method('刘畅')


all_class = []


class Classroom:
    """属性:学⽣生，班级名"""
    def __init__(self, name, age, class_name):
        self.name = name
        self.class_name = class_name
        self.age = age
        self.all_student = []
    def stu_add(self, stu):
        self.all_student.append(stu)
    def stu_del(self, stu_name):
        for stu in self.all_student.copy():
            if stu.name == stu_name:
                self.all_student.remove(stu)
                break
    def stu_ave(self):
        sum1 = 0
        for i in self.all_student:
            sum1 += i.age
        count = len(self.all_student)
        average = sum1 / count