python文件部分：

user = {'username':None}
shopping_trolley = {}
shopping_num = [0]
money = [0]
my_money = [0]
#获取商品列表
def get_goods_list():
    with open('shopping.txt', encoding='utf-8') as fr:
        shopping_dic = eval(fr.read())
    return shopping_dic
shopping_dic = get_goods_list()
#登录
def login():
    if not user['username']:
        print("欢迎来到登录页面^-^\n")
        usename = input("请输入你的用户名：")
        password = input("请输入你的密码：")
        #打开文件判断文件中是否存在用户名和密码
        with open('user_info.txt',encoding='utf-8') as fr:
            data = fr.read().split('|')
            user_info = (f"{usename}:{password}")
            if user_info in data:
                print("登录成功！")
                print(f"欢迎{usename},你当前的账户余额为：{my_money[0]}\n")
                user['username'] = usename
            else:
                print("登录失败")
    else:
        print(f"尊敬的:{user['username']},你已经登录，无需重复登录^-^")
#注册
def register():
    print("欢迎来到注册页面^-^\n")
    #获取用户注册的用户名和密码
    username = input("请输入你的用户名：")
    password = input("请输入你的密码：")
    #将注册信以追加的形式存入文件
    with open('user_info.txt','a') as fa:
        fa.write(f"{username}:{password}|")
        print("注册成功！")
#购物
def shopping():
    if user['username']:
        print("欢迎来到购物界面！^-^")
        while True:
                for k,v in enumerate(shopping_dic):
                    print(f"序号:{k},{v}")
                get_goods_num = input("请输入商品序号(不需要则按q退出):")
                if get_goods_num == 'Q' or get_goods_num =='q':
                    print(f"你当前购物车中有{shopping_num[0]}件物品")
                    break
                if get_goods_num =="":
                    print("请输入正确的序号\n")
                    continue
                get_goods_num = int(get_goods_num)
                goods = shopping_dic[get_goods_num]
                print(f"{goods}加入购物车成功\n")


                goods_name = goods[0]
                if goods_name in shopping_trolley:
                    shopping_trolley[goods_name] += 1
                    shopping_num[0] +=1
                else:
                    shopping_trolley[goods_name] = 1
                    shopping_num[0] += 1
                money[0] += goods[1]

    else:
        print("您当前尚未登录！")
#购物车
def shopping_list():
    if user['username']:
        print("欢迎来到购物车功能^-^")
        while True:
            print(f"你当前加入购物车的商品为{shopping_trolley},总价格为{money[0]}")
            delete = input("请问是否移除商品，不移除则按q退出：")
            if delete == 'Q' or delete =='q':
                break
            elif delete =="":
                print("请输入正确的名称或字母\n")
                continue
            shopping_trolley[delete] -=1
            if shopping_trolley[delete] == 0:
                shopping_trolley.pop(delete)
            for goods in shopping_dic:
                if delete in goods:
                    money[0] -= goods[1]
                    shopping_num[0] -= 1
    else:
        print("请登录后再试！")
#结算
def pay():
    if user['username']:
        print("欢迎来到结算页面^-^")
        print(f"您当前的账户余额为：{my_money[0]}")
        while True:
            print(f"您当前中的购物车中有：{shopping_trolley},总价为{money[0]}")
            settle_account = input("是否结算，结算请输入y，退出请输入n(退出则会清空购物车):").lower()
            if settle_account == 'y':
                if my_money[0] > money[0]:
                    print(f"支付{money[0]}成功,已成功购买{shopping_trolley}")
                    shopping_num[0] = 0
                    my_money[0] = my_money[0] - money[0]
                    print(f"你当前余额为：{my_money[0]}元")
                    shopping_trolley.clear()
                    money[0] = 0
                    break
                else:
                    print(f"你的余额不允许你这么做哦,你当前余额为{my_money[0]}←_←,请充值后再重试")
            elif settle_account == 'n':
                shopping_trolley.clear()
                money[0] = 0
                print("清空购物车成功！")
                break
            else:
                print("输入不合法")
    else:
        print("请登录后再试！")
#充值
def recharge():
    if user['username']:
        print("欢迎来到充值界面^-^")
        print(f"您当前余额为：{my_money[0]}")
        while True:
            top_up = input("请输入你充值的金额:")
            if top_up.isdigit():
                my_money[0] += int(top_up)
                if my_money[0] != 0:
                    print("充值成功!")
                    print(f"您当前的账户余额为：{my_money[0]}")
                    break
            elif  top_up == "":
                print("请输如你需要的数目！")
            else:
                print("充值失败")
                continue
    else:
        print("请登录后再试！")
#退出登录
def exit():
    if user['username']:
        while True:
            exi_login = input(f"尊敬的:{user['username']},是否退出登录,退出请输入y,取消请输入n:").lower()
            if exi_login == 'y':
                user['username'] = ""
                print("退出成功！")
                break
            elif exi_login == 'n':
                print("取消退出登录成功！")
                break
            else:
                print("请输入y/n")

    else:
        print("你当前尚未登录!")
# 主函数
def mian():
    mian_list = """
    1：注册
    2：登录
    3：购物
    4：购物车
    5：结账
    6：充值入口
    7：退出登录
    """
    mian_func = {
        '1': register,
        '2': login,
        '3': shopping,
        '4': shopping_list,
        '5': pay,
        '6': recharge,
        '7': exit
    }
    mian_len = len(mian_func)
    while True:
        print(mian_list)
        select_serv=input("请选择服务(按Q退出):")
        if select_serv == 'Q' or select_serv =='q':
            print("欢迎下次光临^-^")
            break
        if not select_serv.isdigit():
            print('请输入数字！')
            continue
        # select_serv = int(select_serv)
        if select_serv > str(mian_len):
            print("你输入的数字不合法！")
            continue
        mian_func[select_serv]()
mian()

购物列表文件
[
['变形金刚', 199],
['玩具汽车', 299],
['电动玩具', 399],
['流光星陨', 499],
['阿波菲斯', 599],
['荒古遗尘', 699],
['圣耀救赎', 799],
['苍穹幕落', 899],
['夜雨黑瞳', 999],
['界·夜雨黑瞳', 1999]]