Python购物车程序

1.要求用户输入工资，然后打印购物菜单

2.用户可以不断的购买商品，直到钱不够为止

3.退出时格式化打印用户已购买的商品和剩余金额

salary = int(input("请输入你的工资："))
shop_price = 0
shop_list =[["a",100],["b",50],["c",76],["d",229],["e",21]]
shouhuodan = []
for i in range(5):
     print("代码",i,"商品名称：",shop_list[i][0],"商品价格",shop_list[i][1])
a = input("是否开始选择：")
while (a!="no"):
    shop_trade = int(input("请选择购买的商品代码:"))
    shouhuodan.extend(shop_list[shop_trade])
    shop_price = shop_price + shop_list[shop_trade][1]
    if shop_price < salary:
        print("余额；",salary - shop_price)
    else:
        if len(shouhuodan)==2:
            shouhuodan = []
        else:
            shop_price = shop_price - shouhuodan[-1]
            shouhuodan.pop()
            shouhuodan.pop()
        print("你选择的商品已超出余额限制！")
    a = input("是否继续购买：")
if (len(shouhuodan)==0):
    print("商品名称：",0, "商品价格", 0)
else:
    print("商品",shouhuodan[::2],"价格",shouhuodan[1::2])