trades = [

    {"trade_name": "Macbook", "value": 12000},

    {"trade_name": "Gucci-glasses", "value": 6388},

    {"trade_name": "Logines", "value": 8730},

    {"trade_name": "Girlfriend", "value":23000},

    {"trade_name": "Tesla", "value": 476000},

    {"trade_name": "Diamond-ring", "value": 18800},

    {"trade_name": "Villa", "value": 6500000},

]

flag = 1

shopping_cart = {}

usr_fund = 0

while flag:

    fund = input('尊敬的客户,请输出您的资产: ').strip()

    if fund.isdigit():

        usr_fund += int(fund) # 得到用户的总资产

        break

    else:

        print('您输入的金额有误,请重新输入')

while flag:

    for i in trades:

        print(range(len(trades)),i['trade_name'],i['value'])

        # 取得商品序号,商品和价钱

    res = input('请您输入商品序号或者N/Q结算或者退出: ').strip()

    if res.upper() =='Q':  # 执行退出操作

        exit('有需要再来光顾哦!')

    elif res.upper() =='N': #执行结算操作

        while flag:

            if usr_fund < sum(shopping_cart.values()):

                # 如果用户金额小于结算金额

                cmd = input(f"您还差{(sum(shopping_cart.values()) - usr_fund)}元才能付款,输入1/0可以选择充值或取消购买").strip()

                if cmd == '':

                    while 1:

                        cmd_1 = input('充值金额: ').strip()

                        if cmd_1.isdigit():

                            usr_fund += int(cmd_1)

                            break

                        else:

                            print('您输入的有误,请重新输入')

                elif cmd == '':

                    exit('有需要再来光顾哦!')

                else:

                    print('您输入的有误,请重新输入')

            else:

                print('您的购物车现在有: ')

                for i in shopping_cart:

                    print(i,shopping_cart[i])

                print(f"您的余额还有{usr_fund - sum(shopping_cart.values())}元")

                break

        break

    elif res.isdigit(): #如果用户输入的是序号,那就加入购物车

        res_1 = int(res)

        if res_1 - 1 in [range(len(trades)) for i in trades]: #如果用户输入的序号在商品列表中

            if trades[res_1]['trade_name'] not in shopping_cart:

                shopping_cart.setdefault(trades[res_1 -1]['trade_name'],trades[res_1 -1]['value'])

            else:

                shopping_cart[trades[res_1 -1]['trade_name']] += trades[res_1 -1]['value']

            print('\n'f"{trades[res_1 -1]['trade_name']}已添加到购物车,价值{trades[res_1 -1]['value']}元"'\n')

        else:

            print('您输入的有误,请重新输入')

    else:

        print('您输入的有误,请重新输入')