def init():                             # 系统初始化（读取所有商品并保存为全局变量）return Truedef login():                            # 登录认证passdef register():                         # 新用户注册，第一次登录，输入salarypassdef show_products():                    # 展示所有商品的序号/名称/单价passdef user_choice():                      # 让用户输入选择的商品序号或者'q', 'q'返回就调用shwo_current_shopping_logpassdef show_current_shopping_log():        # 显示本次购物日志passdef balance_enough():                   # 检验余额是否足够passdef add_cart():                         # 放入购物车，高亮显示，扣费。并调用日志信息shopping_log()和 show_user_balance()passdef shopping_log():                     # 添加到本次消费日志和用户信息的日志中passdef save_user():                        # 将用户信息存入文件中去passdef show_user_balance():                # 显示当前用户的历史购物日志passdef show_shopping_log():                # 显示用户所有历史的消费记录pass

#!usr/bin/env python
# -*- coding:utf-8 -*-
# Author: Jane Yueimport sys
import jsonopen_line = '''有机生鲜 多*快*好*省
----------------------------------
a键: 新用户注册
b键：登陆账户
q键：退出
----------------------------------
'''user_menu = ['退出', '购物', '充值', '查询']def save_into_file(db_dict, filename='user_data.json'):# 辅助函数：将信息存入文件，默认文件为 user_status.jsonwith open(filename, "w", encoding="utf-8") as f:json.dump(db_dict, f)def load_from_file(filename='user_data.json'):# 辅助函数：读取文件信息，默认文件为 user_status.jsonwith open(filename, 'r', encoding="utf-8") as f:db_dict = json.load(f)return db_dictdef openline():# 程序开始while True:print(open_line)open_choice = input('请根据菜单选择：').strip()if open_choice == "a":username = input("用户名：")register(username)elif open_choice == "b":login()elif open_choice == "q":sys.exit()else:print("错误信息，重新输入")continuedef login():# 登录认证db_dict = load_from_file()                  # python字典格式：{"username":{"密码": "password","历史记录":["商品"], "余额": 000}}count = 0while count < 3:username = input('用户名: ')if username in db_dict:password = input('密码: ')if password == db_dict[username]["密码"]:print("小主，欢迎回来买买买！")core_menu(username)else:count += 1print("密码错误，您还有%d机会。" % (3 - count))continueelse:print("用户名不存在，请注册新账户")register(username)return Truedef register(username):# 注册新账户并存入文件db_dict = load_from_file()while True:print("用户名：%s" % username)password = input("密码：")if len(password.strip()) > 0:db_dict[username] = {"密码": "password","历史纪录": ["商品"],"余额": 000}ini_balance = int(input("首次充值额："))db_dict[username]["余额"] = ini_balancesave_into_file(db_dict)print("欢迎第一次登陆,%s" % username)core_menu(username)else:print("请输入密码")continuedef core_menu(username):# 用户登陆后，显示选项及菜单print('用户菜单'.center(25, "="))for i in user_menu:print(user_menu.index(i), i)while True:choice = input('亲，请选择 >>> ')if choice == "1":shopping(username)elif choice == "2":topup(username)elif choice == "3":show_user_balance(username)elif choice == "q":print('88，亲')sys.exit()else:print('错误信息，请重新选择')continuedef shopping(username):# 购物menu_dict = load_from_file("menu.json")db_dict = load_from_file()while True:for i in sorted(menu_dict):print(i)option1 = input('请选择\033[001m产品分类\033[0m 【b】返回 【任意键】退出').strip()            # 001加粗if option1 in menu_dict:print('{}清单如下：'.format(option1).rjust(25, '-'))for k in menu_dict[option1]:print(k, menu_dict[option1][k])while True:option2 = input('请选择 \033[001m商品\033[0m 加入购物车【b】返回 【q键】退出 ').strip()if option2 in menu_dict[option1]:option3_num = input('请输入购买数量').strip()if option3_num.isdigit() and int(option3_num) <= menu_dict[option1][option2]['数量']:num = int(option3_num)price = menu_dict[option1][option2]['单价']cost = num*pricebalance = db_dict[username]['余额']if cost<=balance:db_dict[username]['余额'] -= costdb_dict[username]['历史记录'].append(option2)                  # 添加字典value值数据？？？
                            save_into_file(db_dict)menu_dict[option1][option2]['数量'] -= numsave_into_file(menu_dict, "menu.json")print("商品已购，您的最新余额为\033[34m%d\033[0m" % (db_dict[username]['余额']))breakelse:print('账户余额不足，请充值')core_menu(username)else:print("抱歉，商品数目不足")continueelif option2 == 'b':breakelif option2 == 'q':sys.exit()else:print('错误信息，请重新选择')continueelif option1 == 'b':core_menu(username)else:sys.exit()def topup(username):# 充值db_dict = load_from_file()top_up = input('请填写充值金额')if top_up.isdigit():db_dict[username]["余额"] += int(top_up)save_into_file(db_dict)show_user_balance(username)else:print('错误信息，请重新选择')core_menu(username)def show_user_balance(username):# 显示用户余额db_dict = load_from_file()print('{},您的当前余额为\033[34m{}\033[0m'.format(username,db_dict[username]['余额']))show_shopping_log(username)def show_shopping_log(username):# 显示用户所有历史的消费记录db_dict = load_from_file()shopping_log = db_dict[username]['历史记录']if shopping_log == '':print("您在本小店没有消费记录")core_menu(username)else:print('历史消费如下：',shopping_log)choice = input('【b键】返回主菜单 【q键】退出')if choice == 'q':sys.exit()else:core_menu(username)if __name__ == '__main__':openline()