1.聲明?個(gè)電腦類: 屬性:品牌勾笆、顏?阿宅、內(nèi)存?小 方法:打游戲候衍、寫代碼、看視頻

a.創(chuàng)建電腦類的對(duì)象洒放，然后通過(guò)對(duì)象點(diǎn)的?方式獲取蛉鹿、修改、添加和刪除它的屬性

class Computer:

    def __init__(self, brand='', color='', ram=''):
        self.brand = brand
        self.color = color
        self.ram = ram

    def coding(self):
        print('coding~~~')

    def wvideo(self):
        print('watching')

# 對(duì)象點(diǎn)
c1 = Computer('dell', 'grey', '16')
# 查
print(c1.brand)
# 修改
c1.color = 'pink'
print(c1.color)
# 添加
c1.price = '15000'
print(c1.price)
# 刪除
print(c1.ram)
del c1.ram
print(c1.ram)

b.通過(guò)attr相關(guān)?方法去獲取往湿、修改妖异、添加和刪除它的屬性  
# 查
getattr(c1, 'brand')
print(c1.brand)
# 修改
setattr(c1, 'color', 'pink')
print(c1.color)
# 添加
setattr(c1, 'price', '15000')
print(c1.price)
#刪除
delattr(c1, 'ram')
# print(c1.ram)

2.聲明?個(gè)人的類和狗的類:

狗的屬性:名字惋戏、顏色、年齡

狗的方法:叫喚

人的屬性:名字他膳、年年齡响逢、狗

人的方法:遛狗

a.創(chuàng)建?人的對(duì)象小明，讓他擁有?一條狗大黃棕孙，然后讓小明去遛大黃

class Dog:
    def __init__(self, name='', color='', age=''):
        self.name = name
        self.color = color
        self.age = age
    def bark(self):
        print('嗷嗚~~~')

d1 = Dog(name='大黃')


class  People:
    def __init__(self, name='', age='', pet=''):
        self.name = name
        self.age = age
        self.pet = pet

    def walk_dog(self):
        print('%s溜%s' % (p1.name, p1.pet))


p1 = People(name='小明', pet='大黃')
p1.walk_dog()

3.聲明?一個(gè)圓類舔亭，自己確定有哪些屬性和方法

pi = 3.1415926


class Circle:

    def __init__(self, radius = 0):
        self.radius = radius

    def area(self):
        print(pi * self.radius ** 2)

    def perimeter(self):
        print(2*pi*self.radius)


c1 = Circle(5)
c1.area()
c1.perimeter()

4.創(chuàng)建?一個(gè)學(xué)?生類:

屬性:姓名，年齡蟀俊，學(xué)號(hào)

方法:答到钦铺，展示學(xué)?生信息

創(chuàng)建?一個(gè)班級(jí)類:

屬性:學(xué)?生，班級(jí)名

方法:添加學(xué)?生肢预，刪除學(xué)生矛洞，點(diǎn)名, 求班上學(xué)生的平均年齡

import random


class Student:
    def __init__(self, name, age=0, num='0001'):
        self.name = name
        self.age = age
        self.num = num
        self.state = random.randint(0, 1)    # 是否在教室的狀態(tài)， 0 -> 不在, 1 -> 在

    def amount(self):
        print('%s 到!' % self.name)

    def show(self):
        print('姓名:%s 年齡:%d 學(xué)號(hào):%s' % (self.name, self.age, self.num))


class Class:
    def __init__(self, name):
        self.students = [
            Student('stu1', 19, '001'),
            Student('stu2', 20, '002'),
            Student('stu3', 23, '003'),
            Student('stu1', 19, '004'),
            Student('stu4', 30, '005'),
        ]
        self.name = name
        # 學(xué)號(hào)生成器
        self.__nums = ('stu'+str(num).zfill(3) for num in range(50))

    # 添加學(xué)?生
    def add_student(self):
        # 輸入學(xué)生信息
        stu_name = input('姓名:')
        stu_age = int(input('年齡:'))
        stu_num = next(self.__nums)
        # 創(chuàng)建學(xué)生對(duì)象
        stu = Student(stu_name, stu_age, stu_num)
        # 將學(xué)生添加到班級(jí)中
        self.students.append(stu)

    # 刪除學(xué)生
    def del_student(self):
        del_name = input('刪除學(xué)生的姓名:')
        for stu in self.students[:]:
            if stu.name == del_name:
                self.students.remove(stu)

    # 點(diǎn)名
    def call_the_roll(self):
        for stu in self.students:
            # 喊名字
            print(stu.name)
            # 如果在教室
            if stu.state:
                # 答到
                stu.amount()
            else:
                print('....')

    def average_age(self):
        sum1 = 0
        for stu in self.students:
            sum1 += stu.age
        average = sum1//len(self.students)
        print('平均年齡: %d' % average)
        return average

    def cl_show(self):
        for stu in self.students:
            stu.show()


class1 = Class('py1902')

print('=========添加學(xué)生===========')
# for _ in range(5):
class1.add_student()
class1.cl_show()
print('=========刪除學(xué)生===========')
class1.del_student()
class1.cl_show()
print('=========點(diǎn)名===========')
class1.call_the_roll()
class1.average_age()