[terry笔记]python购物程序

如下是一个购物程序：

先输入工资，显示商品列表，购买，quit退出，最后格式化输出所买的商品。

 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