https://www.cnblogs.com/gide/p/6955895.html

 

https://www.cnblogs.com/alex3714/articles/8955091.html

#!/usr/bin/env python# -*- coding:utf-8 -*-# _AUTHOR_  : zhujingxiu# _DATE_    : 2018/1/4import osimport hashlibimport jsonimport time"""作业题目: 购物车程序基础要求：1、启动程序后，输入用户名密码后，让用户输入工资，然后打印商品列表2、允许用户根据商品编号购买商品3、用户选择商品后，检测余额是否够，够就直接扣款，不够就提醒4、可随时退出，退出时，打印已购买商品和余额5、在用户使用过程中， 关键输出，如余额，商品已加入购物车等消息，需高亮显示扩展需求：1、用户下一次登录后，输入用户名密码，直接回到上次的状态，即上次消费的余额什么的还是那些，再次登录可继续购买2、允许查询之前的消费记录"""# 高亮HL_OKBLUE = '\033[94m'HL_OKGREEN = '\033[92m'HL_FAIL = '\033[91m'HL_ENDC = '\033[0m'# 出错消息ERROR_NO_RESULT = HL_FAIL + '没有记录' + HL_ENDCERROR_EMPTY_CART = HL_FAIL + '您的购物车空空如也' + HL_ENDCERROR_NO_GOODS = HL_FAIL + '没有该商品' + HL_ENDCERROR_USER_INPUT = HL_FAIL + '输入不合法' + HL_ENDCERROR_USER_PASSWORD = HL_FAIL + '用户名密码不匹配' + HL_ENDCERROR_USER_LOGIN = HL_FAIL + '用户已登出，请重新登录' + HL_ENDCERROR_USER_EXISTS = HL_FAIL + '用户已存在' + HL_ENDCERROR_USER_NOT_EXISTS = HL_FAIL + '用户不存在' + HL_ENDCERROR_USER_BALANCE = HL_FAIL + '用户余额不足' + HL_ENDC# 成功消息SUCCESS_USER_HALT = HL_OKBLUE + '退出系统' + HL_ENDCSUCCESS_USER_ADDED = HL_OKGREEN + '用户注册成功,您将进入到用户中心' + HL_ENDCSUCCESS_USER_LOGIN = HL_OKGREEN + '用户登录成功' + HL_ENDCSUCCESS_USER_RECHARGE = HL_OKGREEN + '用户充值成功' + HL_ENDCSUCCESS_USER_REPASSWD = HL_OKGREEN + '用户密码修改成功' + HL_ENDCSUCCESS_USER_PURCHASED = HL_OKGREEN + '购买成功，商品已加入购物车' + HL_ENDC# 用户存档目录users_dir = 'module01_users'if not os.path.exists(users_dir):    os.mkdir(users_dir)# 商品列表goods = [    {
    "name": "电脑", "price": 1999},    {
    "name": "鼠标", "price": 10},    {
    "name": "游艇", "price": 20},    {
    "name": "美女", "price": 998},    {
    "name": "机器人", "price": 2998},    {
    "name": "特斯拉", "price": 5998}]products = []for i, product in enumerate(goods, 100):    products.append("%d. %s\t %.2f" % (i, product['name'], product['price']))goods_menu = """------------商品列表----------序号 名称\t 价格%s-----------------------------999. 返回上级  0. 退出系统""" % os.linesep.join(products)# 用户中心面板user_menu = """------------用户中心----------11. 购买商品12. 查看购物车13. 查看账户流水14. 账户充值15. 修改密码0. 退出系统-----------------------------"""# 主操作面板main_menu = """------------操作面板----------1. 登录商城2. 注册用户0. 退出系统-----------------------------"""# 初始化操作标识，用户信息，操作面板option, user_info, menu = -1, {}, main_menuwhile option:    if int(option) >= 0:        option = int(option)    else:        print(menu)        option = input("请输入操作序号>>:").strip()        if option.isdigit():            option = int(option)        else:            print(ERROR_USER_INPUT)            option = -1            continue    # 用户退出系统    if option == 0:        if 'cart' in user_info:            _cart_amount = 0            if len(user_info['cart']):                print("您的购物车清单如下：".center(50, '*'))                print("序号".ljust(4), "商品".center(8, ' '), "金额".center(8, ' '), "数量".ljust(4))                for i, log in enumerate(user_info['cart'][::-1], 1):                    _cart_amount += log[1]                    print("%s %s %s %s " % (                        str(i).ljust(4), str(log[0]).center(8, ' '), str(float('%.2f' % log[1])).center(12, ' '),                        str(log[2]).ljust(4)))            else:                print(ERROR_NO_RESULT)            print("购物车总额:\033[92m%.2f\033[0m,您的账户余额:\033[92m%.2f\033[0m" % (_cart_amount, user_info['balance']))        user_info = {}        print(SUCCESS_USER_HALT)        break    # 用户登录    elif option == 1:        username = input("请输入登录账户，（9，返回）>>:").strip()        if username == '9':            menu = main_menu            option = -1            continue        password = input("请输入登录密码>>:").strip()        if len(username) <= 0 or len(password) <= 0:            print(ERROR_USER_INPUT)            menu = main_menu            option = -1            continue        # 验证用户是否存在        username_encypt = hashlib.md5()        username_encypt.update(bytes(username, encoding='utf-8'))        user_file = os.path.join(users_dir, ''.join([username_encypt.hexdigest(), '.json']))        if not os.path.exists(user_file):            print(ERROR_USER_NOT_EXISTS)            option = 1            continue        # 验证登录密码，登录成功则进入用户中心        user_info = json.load(open(user_file, 'r'))        password_encypt = hashlib.md5()        password_encypt.update(bytes(password, encoding='utf-8'))        if 'password' in user_info and user_info['password'] == password_encypt.hexdigest():            print("欢迎回来 \033[95m%s\033[0m ，您将进入用户中心面板" % username)            menu = user_menu            option = -1        else:            print(ERROR_USER_PASSWORD)            option = 1    # 用户注册    elif option == 2:        username = input("请输入用户账号，（9，返回）>>:").strip()        if username == '9':            menu = main_menu            option = -1            continue        password = input("请输入用户密码>>:").strip()        balance = input("请输入账户金额>>:").strip()        # 检查输入是否合法        if len(username) <= 0 or len(password) <= 0 or not balance.isdigit():            print(ERROR_USER_INPUT)            option = 2            continue        username_encypt = hashlib.md5()        username_encypt.update(bytes(username, encoding='utf-8'))        user_file = ''.join([username_encypt.hexdigest(), '.json'])        # 检查是否已存在相同用户名        user_exists = False        for i in os.listdir(users_dir):            if user_file == os.path.basename(i):                user_exists = True                break        # 不存在则创建用户,创建成功直接进入用户中心        if not user_exists:            password_encypt = hashlib.md5()            password_encypt.update(bytes(password, encoding='utf-8'))            user_info = {                'username': username,                'password': password_encypt.hexdigest(),                'balance': float(balance),                'cart': [],                'logs': [],            }            with open(os.path.join(users_dir, user_file), 'w') as f:                json.dump(user_info, f)            print(SUCCESS_USER_ADDED)            menu = user_menu            option = -1        else:            print(ERROR_USER_EXISTS)            option = 2    # 用户已登录    elif option > 10:        # 验证用户信息是否完整        if 'username' not in user_info:            print(ERROR_USER_LOGIN)            menu = main_menu            option = -1            user_info = {}            continue        # 验证用户信息是否存档        username_encypt = hashlib.md5()        username_encypt.update(bytes(user_info['username'], encoding='utf-8'))        user_file = os.path.join(users_dir, ''.join([username_encypt.hexdigest(), '.json']))        if not os.path.exists(user_file):            menu = main_menu            option = -1            user_info = {}            continue        # 购买商品        if option == 11:            menu = goods_menu            option = -1        # 查看购物车        elif option == 12:            _cart_amount = 0            if len(user_info['cart']):                print("您的购物车清单如下：".center(50, '*'))                print("序号".ljust(4), "商品".center(8, ' '), "金额".ljust(12, ' '), "数量".ljust(4))                for i, log in enumerate(user_info['cart'][::-1], 1):                    _cart_amount += log[1]                    print("%s %s %s %s " % (                        str(i).ljust(4), str(log[0]).center(8, ' '), str(float('%.2f' % log[1])).center(12, ' '),                        str(log[2]).ljust(4)))            else:                print(ERROR_EMPTY_CART)            print("购物车总额:\033[92m%.2f\033[0m,您的账户余额:\033[92m%.2f\033[0m" % (_cart_amount, user_info['balance']))            menu = user_menu            option = -1        # 查看账户流水        elif option == 13:            if len(user_info['logs']):                print("序号".ljust(4), "时间".center(20, ' '), "商品".center(8, ' '), "金额".center(12, ' '), "备注".ljust(16))                for i, log in enumerate(user_info['logs'][::-1], 1):                    print("%s %s %s %s %s" % (                        str(i).ljust(4), str(log[0]).center(20), str(log[1]).center(8),                        str(float('%.2f' % log[2])).center(12),                        str(log[3]).ljust(16)))            else:                print(ERROR_NO_RESULT)            menu = user_menu            option = -1        # 帐户充值        elif option == 14:            balance = input("请输入充值金额，（b，返回；0，退出系统）>>:").strip()            # 验证输入            if balance == 'b':                menu = user_menu                option = -1                continue            elif balance == '0':                option = 0                continue            elif not balance.isdigit():                print(ERROR_USER_INPUT)                option = 14                continue            # 更新用户信息，并存档            user_info['balance'] += float(balance)            user_info['logs'].append([time.strftime("%Y-%m-%d %H:%M:%S", time.localtime()), '账户充值', float(balance), ''])            with open(user_file, 'w') as f:                json.dump(user_info, f)            print(SUCCESS_USER_RECHARGE, ', 您的余额：\033[92m%.2f\033[0m' % user_info['balance'])            menu = user_menu            option = -1        # 修改密码        elif option == 15:            password = input("请输入新密码，（b，返回；0，退出系统）>>:").strip()            # 验证输入            if password == 'b':                menu = user_menu                option = -1                continue            elif password == '0':                option = 0                continue            # 更新用户信息，并存档            password_encypt = hashlib.md5()            password_encypt.update(bytes(password, encoding='utf-8'))            user_info['password'] = password_encypt.hexdigest()            with open(user_file, 'w') as f:                json.dump(user_info, f)            print(SUCCESS_USER_REPASSWD)            menu = user_menu            option = -1        # 选购商品        elif option >= 100:            if option == 999:                menu = user_menu                option = -1                continue            # 验证商品是否存在            index = option - 100            goods_exists = False            for i, good in enumerate(goods):                if i == index:                    goods_exists = True                    break            if not goods_exists:                print(ERROR_NO_GOODS)                menu = goods_menu                option = -1                continue            # 验证余额            amount = float(goods[index]['price'])            if user_info['balance'] < amount:                print(ERROR_USER_BALANCE)                menu = goods_menu                option = -1                continue            # 更新用户余额信息，添加商品到购物车，添加记录到账户流水，重新存档用户信息            user_info['balance'] -= amount            user_info['cart'].append([goods[index]['name'], amount, 1])            user_info['logs'].append(                [time.strftime("%Y-%m-%d %H:%M:%S", time.localtime()), goods[index]['name'], amount, '数量：1'])            with open(user_file, 'w') as f:                json.dump(user_info, f)            print(SUCCESS_USER_PURCHASED, ', 您的余额：\033[92m%.2f\033[0m' % user_info['balance'])            menu = goods_menu            option = -1    else:        print(ERROR_USER_INPUT)        option = -1