面向对象小项目练习（迷你DVD系统）

import sys
import datetime
class DVD(object):#创建DVD类
    def __init__(self,name,state,date):#设置对象属性
        self.name = name
        self.state = state
        self.date = date#设置私有属性
    @property#相当于get方法
    def date(self):
        return self.__date
    @date.setter#相当于set方法
    def date(self,date):
        if self.state == 0:#如果DVD是已借出，那么date时间就不能为空
            self.__date = date
        else:
         self.__date = ""#如果DVD是可借状态，日期可以为空


class Manage():#业务类;继承DVD类的属性
    #初始化光碟
    Dvd_list = []#用于存放Dvd
    def initDvd(self):#先初始化三本书
        d1 = DVD("霸王别姬",1,"")#状态为1，表示可借；状态为0表示已借出
        Manage.Dvd_list.append(d1)
        d2 = DVD("阿甘正传",1,"")#创建实例对象，并初始化值
        Manage.Dvd_list.append(d2)
        d3 = DVD("肖克申救赎",1,"")
        Manage.Dvd_list.append(d3)
    @staticmethod#定义静态方法，不需要创建对象可以直接访问犯法
    def memu():#创建页面方法
        dict1 = {1:"增加DVD",2:"查看DVD",3:"删除DVD",4:"借出DVD",5:"归还DVD",6:"退出"}
        print("-------欢迎使用迷你DVD系统-------")
        for key,value in dict1.items():
            print("\t\t",key,"." + value)
        print("-------------------------------")
    def add(self):#创建增加方法
        flag = False
        while True:
            name = input("请输入DVD名称：")
            new_d = DVD(name,1,"")#将新增的DVD实例化
            Manage.Dvd_list.append(new_d)#添加到Dvd列表
            print("新增%s成功！"%name)
            a = input("是否继续添加：")
            if a == "y":
                flag = True
            else:
                self.select()#同类中调用方法是self.同类方法名
    def find(self):#查找方法
        print("---->查书")
        print("序号\t\t状态\t\t名称\t\t借出日期")
        for i in range(len(Manage.Dvd_list)):
            print(i,"\t\t",Manage.Dvd_list[i].state,"\t",Manage.Dvd_list[i].name,"\t\t",Manage.Dvd_list[i].date)
    def delete(self):
        count = 0
        delete_list = []
        print("---->删除")
        delete_name = input("请输入DVD名称：")
        for i in range(len(Manage.Dvd_list)):
                if Manage.Dvd_list[i].name == delete_name:
                    Manage.Dvd_list.pop(i)
                    print("删除成功！")
                break
        else:
            count += 1
        if count == len(Manage.Dvd_list):
            print("对不起没有该书")

    def loan(self):
        print("---->借出DVD")
        loan_name = input("请输入DVD名称：")
        count = 1
        for i in range(len(Manage.Dvd_list)):
            if Manage.Dvd_list[i].name == loan_name:
                if not Manage.Dvd_list[i].state == 0:
                    Manage.Dvd_list[i].state = 0
                    d1 = datetime.datetime.now()
                    d2 = d1.strftime("%Y-%m-%d")
                    Manage.Dvd_list[i].date = d2
                    count = 0
                    print("借阅成功")
                else:
                    print("暂不可借")
                    count = 0
        if count == 1:
            print("没有找到该DVD")
    def back(self):
        print("---->归还")
        back_name = input("请输入DVD名称:")
        count = 1
        for i in range(len(Manage.Dvd_list)):
            if Manage.Dvd_list[i].state == 0:
                if Manage.Dvd_list[i].name == back_name:
                    back_date = input("请输入归还日期:")
                    d4 = datetime.datetime.strptime(back_date,"%Y-%m-%d")
                    d5 = datetime.datetime.strptime(Manage.Dvd_list[i].date,"%Y-%m-%d")
                    d6 = d4-d5
                    money = d6.days * 5
                    Manage.Dvd_list[i].state = 1
                    print("归还成功\n 归还日期：%s\n 借出日期：%s\n 租金：%d" %(back_date,Manage.Dvd_list[i].date,money ))
                    count = 0
                    break
            else:
                print("本书没有借出")
                count = 0
                break
        if count == 1:
            print("本店没有该书")
    def select(self):
        self.memu()
        while True:
            num = int(input("选择>>>："))
            if num == 1:  # 调用增加方法
                self.add()
            elif num == 2:  # 调用查看方法
                self.find()
            elif num == 3:  # 调用删除方法
                self.delete()
            elif num == 4:  # 调用借出方法
                self.loan()
            elif num == 5:  # 调用归还方法
                self.back()
            elif num == 6:  # 调用退出方法
                sys.exit()

m = Manage()
m.initDvd()
m.select()