1.聲明?個電腦類: 屬性:品牌菊霜、顏?、內(nèi)存?小 方法:打游戲济赎、寫代碼鉴逞、看視頻

class Computer:

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

    def game(self):
        print('打游戲')

    def code(self):
        print('寫代碼')

    def video(self):
        print('看視頻')

a.創(chuàng)建電腦類的對象，然后通過對象點的?方式獲取司训、修改构捡、添加和刪除它的屬性

computer = Computer(brand='Timi', color='gray', memory=16)
print(computer.brand)
computer.brand = 'Asus'
print(computer.brand)
computer.weight = 2
print(computer.weight)
del computer.weight
print(computer.weight)

b.通過attr相關(guān)?方法去獲取、修改壳猜、添加和刪除它的屬性

computer1 = Computer(brand='Timi', color='gray', memory=16)
print(getattr(computer1, 'brand'))
setattr(computer1,'brand','Asus')
print(computer1.brand)
setattr(computer1,'weight',2)
print(computer1.weight)
delattr(computer1,'brand')
print(computer1.brand)

2.聲明?個人的類和狗的類:
狗的屬性:名字勾徽、顏色、年齡
狗的方法:叫喚
人的屬性:名字统扳、年齡喘帚、狗
人的?法:遛狗

a.創(chuàng)建?的對象?明，讓他擁有?條狗?黃咒钟，然后讓?明去遛??

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

    def bark(self):
        print('%s:汪汪汪'%self.name)

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

    def walk_the_dog(self):
        print('%s遛%s' %(self.name,self.dog_name))

dog1= Dog('大黃', 'yellow', 3)
people1 = People('小明', 18, dog1.name)
people1.walk_the_dog()
dog1.bark()

3.聲明?一個圓類吹由，自己確定有哪些屬性和方法

from math import pi,sqrt

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

    def get_center(self):
        print('圓的圓心為',self.center)

    def get_radius(self):
        print('圓的半徑為',self.radius)

    def set_center(self, center):
        self.center = center

    def set_radius(self, radius):
        self.radius = radius

    def area(self):
        print('半徑為%.2f的圓的面積為%.2f'%(self.radius,(pi * (self.radius **2))))

    def perimeter(self):
        print('半徑為%.2f的圓的周長為%.2f'%(self.radius,(pi * 2 * self.radius)))

    def center_distance(self):
        print('圓心和原點的距離為%.2f'%(sqrt(self.center[0]**2 + self.center[1]**2)))

circle = Circle(3.1 ,(2,3))
circle.set_center((1,1))
circle.set_radius(2.9)
circle.get_center()
circle.get_radius()
circle.area()
circle.perimeter()
circle.center_distance()

4.創(chuàng)建?個學?生類:

屬性:姓名，年齡朱嘴，學號
方法:答到溉知，展示學?信息
創(chuàng)建?個班級類:
屬性:學?，班級名
方法:添加學生腕够，刪除學生级乍，點名, 求班上學生的平均年齡

class Student:
    def __init__(self, name, age, stu_id):
        self.name = name
        self.age = age
        self.stu_id = stu_id

    def answer(self):
        print(self.name, self.age, self.stu_id)

class Class:
    def __init__(self, student_list, class_name):
        self.student_list = student_list
        self.class_name = class_name

    def add_student(self, student):
        self.student_list.append(student)
        print('%s成功添加!'%student.name)

    def del_student(self, name):
        for student in self.student_list[:]:
            if student.name == name:
                self.student_list.remove(student)
                print('%s成功刪除!'%name)
                break
        else:
            print('%s不在名單中！'%name)

    def call_name(self):
        print('========%s點名========='%self.class_name)
        for student in self.student_list[:]:
            student.answer()

    def ave_age(self):
        sum = 0
        for student in self.student_list[:]:
            sum += student.age
        print('%s的平均年齡為%.2f'%(self.class_name,(sum/len(self.student_list))))


s1 = Student('小明', 12 , 'py123')
s2 = Student('小紅', 17 , 'py124')
s3 = Student('小王', 14 , 'py125')
s4 = Student('小張', 15 , 'py126')
s5 = Student('小楊', 11 , 'py127')

c1 = Class([s1,s2],'class1')
c1.add_student(s3)
c1.add_student(s4)
c1.add_student(s5)
c1.del_student('小紅')
c1.call_name()
c1.ave_age()