5.写一个类，封装所有和数学运算相关的功能

    class MathMethod:
        def __init__(self,num1=1,num2=1):
            self.num1=num1
            self.num2=num2
        def choose_method(self,type):
            if type=='+':
                sum=self.add_method()
                return sum
            if type=='-':
                sum=self.sub_method()
                return sum
            if type=='*':
                sum=self.ride_method()
                return sum
            if type=='/':
                sum=self.except_method()
                return sum
            if type=='%':
                sum=self.savings_method()
                return sum
            if type=="//":
                sum=self.rectify_method()
                return sum
            if type=="**":
                sum=self.exp_method()
                return sum
        def add_method(self):
            return self.num1+self.num2
        def sub_method(self):
            return self.num1-self.num2
        def ride_method(self):
            return self.num1*self.num2
        def except_method(self):
            if self.num2!=0:
                return self.num1/self.num2
            return False
        def savings_method(self):
            if self.num2!=0:
                return self.num1%self.num2
            return False
        def rectify_method(self):
            if self.num2!=0:
                return self.num1//self.num2
            return False
        def exp_method(self):
            return self.num1**self.num2
    method=MathMethod(2,3)
    print(method.choose_method('+'))
    print(method.choose_method('-'))
    print(method.choose_method('*'))
    print(method.choose_method('/'))
    print(method.choose_method('%'))
    print(method.choose_method('//'))
    print(method.choose_method('**'))

5
-1
6
0.6666666666666666
2
0
8

# 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式获取、修改、添加和删除它的属性
    # b.通过attr相关方法去获取、修改、添加和删除它的属性
    class Computer:
        __slots__ = ('brand','color','mem_size','money','address')
        def __init__(self,brand,color,mem_size):
            self.brand=brand
            self.color=color
            self.mem_size=mem_size
        def play_game(self):
            print('可以用来打游戏')
        def write_code(self):
            print('可以用来写代码')
        def look(self):
            print('可以播放电视')
    ap_computer=Computer('苹果','red','8G')
    print(ap_computer.color)
    ap_computer.color='blue'
    print(ap_computer.color)
    ap_computer.address='美国'
    print(ap_computer.address)
    del ap_computer.address
    # print(ap_computer.address)
    print(ap_computer.__getattribute__('mem_size'))
    print(getattr(ap_computer,'color'))
    ap_computer.__setattr__('mem_size','16G')
    print(ap_computer.mem_size)
    setattr(ap_computer,'color','green')
    print(ap_computer.color)
    ap_computer.__setattr__('money','10000元')
    print(ap_computer.money)
    delattr(ap_computer,'money')
    # print(ap_computer.money)
    # ap_computer.__delattr__('money')
    # print(ap_computer.money)

red
blue
美国
8G
blue
16G
green
10000元
2.声明一个人的类和狗的类：狗的属性：名字、颜色、年龄，狗的方法：叫唤，
人的属性：名字、年龄、狗，人的方法：遛狗
a.创建人的对象小明，让他拥有一条狗大黄，然后让小明去遛大黄

class Dog:
    __slots__ = ('dog_name',"color", 'dog_age')
    def __init__(self, name,color, age):
        self.dog_name=name
        self.color=color
        self.dog_age=age
    def dog_call(self):
        return '%s正在旺旺大叫'%(self.dog_name)
    def __str__(self):
        return 'dog_name:%s color:%s dog_age:%d'%(self.dog_name,self.color,self.dog_age)

class Person:
    __slots__ = ('name','age','dog')
    def __init__(self,name,age,dog=[]):
        self.name=name
        self.age=age
        self.dog=dog
    def get_dog(self,name,color, age):
        dog1=Dog(name,color, age)
        self.dog.append(dog1)
        print('%s刚得到一条狗%s'%(self.name,dog1.dog_call()))
    def walk_dog(self):
        dog_name=self.dog[0].dog_name
        return '%s正在遛他刚得到的%s'%(self.name,self.dog[0].dog_name)
p=Person('小明',20)
p.get_dog('大黄','yellow',3)
print(p.walk_dog())

3.声明一个矩形类：

属性：长、宽

方法：计算周长和面积

a.创建不同的矩形，并且打印其周长和面积

class Rect:
    def __init__(self,height,width):
        self.height=height
        self.width=width
    def perimeter(self):
        return 2*(self.width+self.height)
    def area(self):
        return self.height*self.width
rect1=Rect(4,5)
print(rect1.perimeter(),rect1.area())
rect1=Rect(10,3)
print(rect1.perimeter(),rect1.area())
rect1=Rect(15,15)
print(rect1.perimeter(),rect1.area())

18 20
26 30
60 225

4.

创建一个学生类：

属性：姓名，年龄，学号

方法：答到，展示学生信息

创建一个班级类：

属性：学生，班级名

方法：添加学生，删除学生，点名

class Student:
    def __init__(self,name,age,id):
        self.student_name=name
        self.student_age=age
        self.student_id=id
    def answer(self):
        print('%s到'%(self.student_name))
    def check(self):
        print('student_name:%s student_age:%s student_id:%s'\
               %(self.student_name,self.student_age,self.student_id))
    def __str__(self):
        return 'student_name:%s student_age:%s student_id:%s'\
               %(self.student_name,self.student_age,self.student_id)
class Class:
    def __init__(self,grade,student=[]):
        self.student=student[:]
        self.grade=grade
    def add_student(self,name,age):
        id=''
        try:
            max=self.student[0].student_id
            for item in self.student:
                if max<item.student_id:
                    max=item.student_id
            str1=int(max[-1])
            str2=int(max[-2])
            str3=int(max[-3])
            if str1+1>9:
                if str2+1>9:
                    str3+=1
                else:
                    str2+=1
            else:
                str1+=1
            id += 'py1805' + str(str3) + str(str2) + str(str1)
        except IndexError:
            id+='py1805001'
        student1=Student(name,age,id)
        self.student.append(student1)
        student1.check()
    def del_student(self):
        list1=[]
        del_student=input('请输入要删除学生的姓名或则id')
        for item in self.student[:]:
            # print(item.student_id,del_student)
            id=item.student_id
            if del_student==id:
                self.student.remove(item)
                return
            elif del_student==item.student_name:
                list1.append(item)
        for x in range(len(list1)):
            print(x,list1[x])
        del_name=int(input('请输入选择'))
        self.student.remove(list1[del_name])
        for item in self.student:
            print(item)

    def check_student(self):
        for item in self.student:
            print(item)
        check_name=input('输入姓名：')
        for item in self.student:
            if check_name==item.student_name:
                student2=Student(item.student_name,item.student_age,item.student_id)
                student2.answer()
c1=Class('1班')
c1.add_student('小明',20)
c1.add_student('小李',21)
c1.del_student()
c1.add_student('小廖',22)
print(c1.student[0])
c1.del_student()
print(c1.student[0])
c1.check_student()

D:\Python项目\Day12-面向对象\object\venv\word.py\Scripts\python.exe D:/Python项目/Day12-面向对象/object/作业.py
student_name:小明 student_age:20 student_id:py1805001
student_name:小李 student_age:21 student_id:py1805002
请输入要删除学生的姓名或则id小明
0 student_name:小明 student_age:20 student_id:py1805001
请输入选择0
student_name:小李 student_age:21 student_id:py1805002
student_name:小廖 student_age:22 student_id:py1805003
student_name:小李 student_age:21 student_id:py1805002
请输入要删除学生的姓名或则idpy1805002
student_name:小廖 student_age:22 student_id:py1805003
student_name:小廖 student_age:22 student_id:py1805003
输入姓名：小廖
小廖到

6.1.写一个班级类，属性：班级名、学生；功能：添加学生、删除学生、根据姓名查看学生信息，

展示班级的所有学生信息

class Class:
    def __init__(self,grade,student=[]):
        self.student=student
        self.grade=grade
    def add_student(self,name,age):
        id=''
        dict1={}
        try:
            max=self.student[0]['student_id']
            for item in self.student:
                if max<item['student_id']:
                    max=item['student_id']
            str1=int(max[-1])
            str2=int(max[-2])
            str3=int(max[-3])
            if str1+1>9:
                if str2+1>9:
                    str3+=1
                else:
                    str2+=1
            else:
                str1+=1
            id += 'py1805' + str(str3) + str(str2) + str(str1)
        except :
            id+='py1805001'
        dict1['student_name']=name
        dict1['student_age'] = age
        dict1['student_id'] = id
        self.student.append(dict1)
    def del_student(self):
        list1=[]
        del_student=input('请输入要删除学生的姓名或则id')
        for item in self.student[:]:
            # print(item.student_id,del_student)
            id=item['student_id']
            if del_student==id:
                self.student.remove(item)
                return
            elif del_student==item['student_name']:
                list1.append(item)
        for x in range(len(list1)):
            print(x,list1[x])
        del_name=int(input('请输入选择'))
        self.student.remove(list1[del_name])
        for item in self.student:
            print(item)
    def check_all(self):
        for item in self.student:
            print(self.grade,'姓名：%s 年龄：%s id:%s' % (item['student_name'], item['student_age'], item['student_id']))
    def check_student(self):
        check_name=input('输入姓名：')
        for item in self.student:
            if item['student_name']==check_name:
                return '姓名：%s 年龄：%s id:%s'%(item['student_name'],item['student_age'],item['student_id'])
c=Class('1班')
c.add_student('小明',20)
c.add_student('小李',22)
# print(c.check_student())
c.check_all()
c.del_student()
c.check_all()

1班 姓名：小明 年龄：20 id:py1805001
1班 姓名：小李 年龄：22 id:py1805002
请输入要删除学生的姓名或则id小明
0 {'student_name': '小明', 'student_age': 20, 'student_id': 'py1805001'}
请输入选择0
{'student_name': '小李', 'student_age': 22, 'student_id': 'py1805002'}
1班 姓名：小李 年龄：22 id:py1805002