购物车 2019-2-20

li = [["1.iphone X",7399],["2.vivo X21",3598],["3.利用Python进行数据分析",72],["4.迪士尼滑板车", 179],["5.索尼无线蓝牙耳机", 1999]]
shopping_car = [] #已经购买的列表
salarytem = input("请输入你带多少钱来购物:")
if not salarytem.isdigit():
    exit()
salary = int(salarytem)
yuer = salary #余额
for i in li:
    print(i)

buyindex = ""
while True:
    buy = input("输入‘q‘退出,请输入购买物品的编号:")
    if buy.isdigit():
        buyindex = int(buy)
        if buyindex < 1 or buyindex > len(li):
            print("没有您想要的商品，请重新选择...")
            continue
    elif buy == "q":
        if len(shopping_car) < 1:
            print("你没有购买任何物品")
            exit()
        print("----------------购物车的清单-------------------")
        for j in shopping_car:
            print(j)
        print("你已经购买了以上的商品。剩余金额为：%f元" % yuer)
        exit()
    price = li[buyindex-1][1]
    if (price > yuer):
        print("\033您的余额不够，剩余：%f\033，请选择其他商品..." % yuer)
    elif (price <= yuer):
        yuer = yuer - price
        shopping_car.append(li[buyindex-1])
        print("购买成功，购买商品为：\n" + li[buyindex-1][0])