import math

1.聲明?個電腦類: 屬性:品牌混巧、顏?、內(nèi)存?小 方法:打游戲勤揩、寫代碼咧党、看視頻

class Computer:
    def __init__(self, brand, color, memory):
        self.brand = brand
        self.color = color
        self.memory = memory

    def play(self):
        print('play game')

    def write(self):
        print('write code!')

    def watch(self):
        print('watch avi!')


c1 = Computer('聯(lián)想', 'black', '16G')
# a.方法
print(c1.color)
c1.memory = '32G'
c1.cpu = 'i9-9900k'
del c1.color
print(c1.brand, c1.memory, c1.cpu)
# b.attr方式
print(getattr(c1, 'cpu', 'i7-8700'))
setattr(c1, 'memory', '64G')
setattr(c1, 'VGA', 'TITAN RTX')
delattr(c1, 'brand')
print(c1.cpu, c1.VGA, c1.memory)

2.聲明?個人的類和狗的類:
狗的屬性:名字、顏色陨亡、年齡
狗的方法:叫喚
人的屬性:名字傍衡、年齡、狗
人的方法:遛狗
a.創(chuàng)建人的對象小明数苫，讓他擁有一條狗大黃聪舒，然后讓小明去遛大黃

class Dog:
    def __init__(self, dogname, color='black', dogage=1):
        self.dogname = dogname
        self.color = color
        self.dogage = dogage

    def shout(self):
        print('汪汪汪！')

class Person:
    def __init__(self, name, dog：Dog=None, age=22):
        self.name = name
        self.age = age
        self.dog = dog

 def stroll(self):
        if self.dog:
            print('%s正在遛%s' % (self.name, self.dog))
        else:
            print('沒有狗虐急！遛自己')


p2 = Dog('大黃')
p1 = Person('小明', p2.dog)
p1.stroll()

3.聲明一個圓類

import math
class circle:
    def __init__(self, radius):
        self.radius = radius

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

    def peri(self):
        return math.pi * self.radius * 2

4.創(chuàng)建一個學(xué)?生類:
屬性:姓名箱残，年齡，學(xué)號
方法:答到止吁，展示學(xué)生信息

class student:
    def __init__(self, name, age=12, id='1001'):
        self.name = name
        self.age = age
        self.id = id

    def answ(self, name):
        print('%s到被辑！' % name)

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

    def __repr__(self):
        return '姓名：%s敬惦，年齡：%d,學(xué)號：%s' % (self.name, self.age, self.id)


s1 = student('小明')
s1.answ(s1.name)
s1.show(s1.name, s1.age, s1.id)

5.創(chuàng)建一個班級類:
屬性:學(xué)生盼理，班級名
方法:添加學(xué)生，刪除學(xué)生俄删，點(diǎn)名, 求班上學(xué)生的平均年齡

class CLASS:
    students = []

    def __init__(self, clasnum):
        self.clasnum = clasnum

    def addstu(self, student):
        self.students.append(student.__dict__)

    def del_stu(self, student):
        self.students.__delattr__(student)

    def call(self, student):
        print(student)

    def aveg(self, students):
        sum = 0
        for i in students:
            sum += i['age']
        return sum / len(students)


s2 = student('小u', 13)
s3 = student('小hong', 14)
s4 = student('gang', 32)
C1 = CLASS(1)
C1.addstu(s2)
C1.addstu(s3)
C1.addstu(s4)
C1.call(s2.name)
print(C1.aveg(C1.students))