count = 0

 while True:     #做一个循环判断,如果输入的不是数字，基于提示，三次后退出

     salary = input("input your salary:") #输入你的工资

     if salary.isdigit():  #输入的工资必须是数字才能往下走

         salary=int(salary)  #转换为整数型

         break

     else:

         print("Please input a number:")

         count += 1

         if count == 3:

             exit()

 goods_list = [["Iphone",5800],["Macbook",12800],["iMac",15000],["ApplePen",500],["IPod",1200]]  #商品列表

 shop_list = []  #购买的商品列表

 msg = " Product List "

 print(msg.center(30,"*"))

 for i,ele in enumerate(goods_list): #遍历序列中的元素以及它们的下标

     print(i,".",ele[0],ele[1])

 while True:

     choice = input("Which do you want(quit type \"quit\")>>>")

     if choice.isdigit():   #判断选择的是否是数字

         choice = int(choice)   #转换为整数型

         if choice <= len(goods_list)-1:  #选择的数字必须小于列表长度-1，因为下标从0开始

             if salary >= int(goods_list[choice][1]):  #判断工资是否够

                 shop_list.append(goods_list[choice])  #够的话，把商品加入到shopList

                 salary -= goods_list[choice][1]  #减去工资

                 print("You just buy a %s now you have %s RMB" % (goods_list[choice][0],salary))

             else:

                 print("Not enough money")

         else:

             print("There is no such things")

     elif choice == "quit":

         print("Here is what you buy:")  #这里的思路是，创建一个字典，把所买的商品格式化输出

         total = 0

         shop_dict={}

         for item in shop_list:

             things = item[0]

             money = item[1]

             total += int(money)

             if things in shop_dict:

                 shop_dict[things][0] += 1

                 shop_dict[things][1] += money

             else:

                 shop_dict[things]=[1,money]

         for item in shop_dict.items():

             print("%s  %s个  共%s" % (item[0],item[1][0],item[1][1]))

         print("一共花了:",total)

         exit()

     else:

         print("Please input a number")

         continue