__Author__ = "MDJ"
#购物车程序
#1、启动程序后，让用户输入工资，然后打印商品列表
#2、允许用户根据商品编号购买商品
#3、用户选择商品后，检测余额是否够，够就直接扣款，不够就提醒
#4、可随时退出，退出时，打印已购买商品和余额

salary = int(input("please input your salary:"))

goods = [["Foam",300],["Soap",250],["Mask",600],["SPA",100]]
buygoods = []
num = 0
num1 = 0
count = 0
while salary >= 0 :
    while num in range(0,4):
        print("序号",num,"、",goods[num][0],"人民币：",goods[num][1])
        num += 1
    buy = input("请输入要购买的商品序号（输入q退出并结算）：")
    if buy == "q":
        while num1 in range(0,count):
            print("已购买:",goods[buygoods[num1]][0],goods[buygoods[num1]][1])
            num1 += 1
        print("余额:",salary)
        break
    else:
        buy = int(buy)
    if salary - goods[buy][1] >= 0:
        count += 1
        salary = salary - int(goods[buy][1])
        buygoods.append(buy)
　　　　 print("购买成功，余额：",salary)
    else: 
　　　　 print("余额不足：购买需要",int(goods[buy][1]),"   所剩余额：",salary)