牛刀小试-购物车

#author：张浩
#date:2019/8/14
list_goods = [
    ['iphone6s',5800],
    ['mac book',9000],
    ['coffee',30],
    ['python book',80],
    ['bicycle',1500]
]
while True:
    salary = input('请输入充值金额：')
    shopping_car = []
    if salary.isdigit():
        salary = int(salary)
        while True:
            print("以下是商品列表：")
            for goods in list_goods:
                print(list_goods.index(goods)+1,",",goods)
            choice = input("请输入想购买的商品序列号，输入q退出：")
            if choice.isdigit():
                choice = int(choice)
                if 0 < choice <= len(list_goods):
                    if list_goods[choice-1][1] <= salary:
                        shopping_car.append(list_goods[choice - 1])
                        print("已将%s商品加入购物车"%list_goods[choice-1])
                        salary = salary - list_goods[choice-1][1]
                    else :
                        print("余额不足,剩余钱：%s"%salary)
                else:
                    print("输入的商品序号不存在！")
            elif choice == "q":
                print("已购买如下商品：")
                for goods_buy in shopping_car:
                    print(shopping_car.index(goods_buy)+1,goods_buy)
                print("余额：%s"%salary)
                break
            else:
                print("输入有误，请重新输入！")
        break
    else:
        print("输入有误，请重新输入！")