1.聲明一個(gè)電腦類：屬性：品牌、顏色坤溃、內(nèi)存大小 方法：打游戲、寫代碼嘱丢、看視頻
a.創(chuàng)建電腦類的對象薪介，然后通過對象點(diǎn)的方式獲取、修改越驻、添加和刪除它的屬性
b.通過attr相關(guān)方法去獲取汁政、修改、添加和刪除它的屬性

class Computer:
    def __init__(self,brand,color,memory):
        self.brand = brand
        self.color = color
        self.memory = memory
    def play_game(self):
        print('play games')
    def write_codes(self):
        print('write codes')
    def look_video(self):
        print('look at video')

if __name__ == '__main__':
    computer = Computer('HP','white','2g')
    computer.play_game()
    print(computer.brand,computer.color,computer.memory)
    computer.brand = 'Apple'#修改
    computer.type = 'PC'#添加
    del computer.color #刪除
    print(computer.brand, computer.type, computer.memory) #查看
    setattr(computer,'brand','華碩') #修改
    delattr(computer,'memory') #刪除
    print(getattr(computer,'brand'),getattr(computer,'color','Black'),computer.__getattribute__('type')) #查看和添加

result:
play games
HP white 2g
Apple PC 2g
華碩 Black PC

2.聲明一個(gè)人的類和狗的類：
狗的屬性：名字伐谈、顏色烂完、年齡 狗的方法：叫喚
人的屬性：名字、年齡诵棵、狗
人的方法：遛狗
a.創(chuàng)建人的對象小明抠蚣，讓他擁有一條狗大黃，然后讓小明去遛大黃

class Dog:
    def __init__(self,name,color,age):
        self.color = color
        self.name = name
        self.age = age
    def voice(self):
        return(self.name+'-汪汪汪')
class Person:
    def __init__(self,name,age,dog):
        self.name = name
        self.age = age
        self.dog = dog
    def walk_dog(self,voice):
        print(self.name + '->遛狗->'+self.dog+'叫喚->'+voice)
if __name__ == '__main__':
    dog = Dog('大黃','粉色','3')
    person = Person('小明','10',dog.name)
    person.walk_dog(dog.voice())

result:
小明->遛狗->大黃叫喚->大黃-汪汪汪

聲明一個(gè)矩形類：屬性：長履澳、寬 ?方法：計(jì)算周長和面積
a.創(chuàng)建不同的矩形嘶窄，并且打印其周長和面積

class Rectangle:
    def __init__(self,length,width):
        self.length = length
        self.width = width
    def circumference(self):
        return '周長:%.2f' % 2*(self.length+self.width)
    def area(self):
        return '面積:%.2f' % 2*self.length*self.width

創(chuàng)建一個(gè)學(xué)生類：屬性：姓名，年齡距贷，學(xué)號 ?方法：答到柄冲，展示學(xué)生信息
創(chuàng)建一個(gè)班級類：屬性：學(xué)生，班級名 ?方法：添加學(xué)生忠蝗，刪除學(xué)生现横，點(diǎn)名

class Student:
    def __init__(self,name,age,id):
        self.name = name
        self.age = age
        self.id = id
    def sign_in(self):
        print(self.name+'已到達(dá)')
    def show_student(self):
        print( {'name':self.name,'age':self.age,'id':self.id})
class Class:
    def __init__(self,class_name,students):
        self.class_name = class_name
        self.students = students
    def add_student(self,student):
        """
        添加學(xué)生到學(xué)生列表中
        :param student: 學(xué)生信息的字典
        :return:
        """
        self.students.apppend(student)
        print('添加學(xué)生成功.')
    def del_student(self,student_name):
        """
        傳入學(xué)生的姓名后從學(xué)生列表中刪除該學(xué)生
        :param student_name:
        :return:
        """
        for stu in self.students[:]:
            if student_name == stu['name']:
                self.students.remove(stu)
                print('刪除成功')
                break
        print('刪除失敗.')
    def call_name(self):
        for stu in self.students:
            print(stu['name'],end=' ')

5.寫一個(gè)類，封裝所有和數(shù)學(xué)運(yùn)算相關(guān)的功能（包含常用功能和常用值阁最，例例如：pi, e等）

class Maths:
    pi = 3.141592653589793
    e = 2.718281828459045
    @classmethod
    def addition(cls,*number):
        """
        加法
        :param number:遠(yuǎn)算數(shù)元組
        :return:
        """
        return(sum(number))

    @classmethod
    def subtraction(cls,num,*number):
        """
        減法
        :param num:減數(shù)
        :param number:被減數(shù)元組
        :return:
        """
        return(num-sum(number))

    @classmethod
    def multiplication(cls,*number):
        """
        乘法
        :param number: 乘數(shù)元組
        :return:
        """
        count = 1
        for item in number:
            count *= item
        return count
    @classmethod
    def division(cls,num,*number):
        """
        除法
        :param num:除數(shù)
        :param number:被除數(shù)元組
        :return:
        """
        for item in number:
            num /= item
        return num

    @classmethod
    def exponentiation(cls, number,num):
        """
        乘方
        :param number: 底數(shù)
        :param num: 階數(shù)
        :return:
        """
        count = 1
        if num > 0:
            for _ in range(num):
                count *= number
            return count

    @classmethod
    def factorial(cls, number,num):
        """
        階乘
        :param number: 底數(shù)
        :param num:階數(shù)
        :return:
        """
        count = 1
        if not num:
            return 1
        if num > 0:
            for n in range(1,num+1):
                count *= n
            return count

6.1.寫一個(gè)班級類戒祠，屬性：班級名、學(xué)生速种； 功能：添加學(xué)生姜盈、刪除學(xué)生、根據(jù)姓名查看學(xué)生信息配阵，展示班級的所有學(xué)生信息

class Class2:
    def __init__(self,class_name,students):
        self.class_name = class_name
        self.students = students
    def add_student(self,student):
        """
        添加學(xué)生到學(xué)生列表中
        :param student: 學(xué)生信息的字典
        :return:
        """
        self.students.apppend(student)
        print('添加學(xué)生成功.')
    def del_student(self,student_name):
        """
        傳入學(xué)生的姓名后從學(xué)生列表中刪除該學(xué)生
        :param student_name:
        :return:
        """
        for stu in self.students[:]:
            if student_name == stu['name']:
                self.students.remove(stu)
                print('刪除成功')
                break
        print('刪除失敗.')
    def query_student(self,student_name):
        for stu in self.students:
            if student_name == stu['name']:
                print('找到該學(xué)生:%s' % stu)
                break
        print('沒有找到該學(xué)生')
    def all_students(self):
        for stu in self.students:
            print(stu)