Day3购物车优化
需求：
- 判断用户是否第1次登录，登录过的用户显示上次余额
- 商品信息需储存在文档中
- 用户购买的商品信息和余额需记录在文档中
- 用户在购买过程可随时退出
Readme：
相关文档：
1.商品信息文档ShoppingInfo.txt
iPhone:5000 使用：冒号连接商品和价格
2.购买信息文档BuyInfo.txt
注：使用以下格式储存
Your balance:63790
------------shopping list(2018-04-25 11:28:34)-----------
iPhone:5000
MacPro:9800
iPad:3000
Desk:500
Water:10
-----------------------end---------------------------
流程图：
代码：
1 #-*- coding:utf-8 -*- 2 #Version：python3.5 3 4 import os,time 5 6 #時間格式 7 ISOTIMEFORMAT='%Y-%m-%d %X' 8 time_record = time.strftime( ISOTIMEFORMAT, time.localtime() ) 9 #文件路徑變量 10 shopping_info_file = 'I:\pythontest\ShoppingInfo.txt' 11 buy_info_file = 'I:\pythontest\BuyInfo.txt' 12 13 shopping_list = [] #從商品信息文件讀取生成列表 14 shopping_cart = [] #已購買商品生成列表 15 16 #判斷是否第1次登錄，如以前登錄過，則讀取上次剩餘餘額 17 if os.path.exists(buy_info_file): 18 with open(buy_info_file,'r+') as buy_info: 19 for lines1 in buy_info: 20 (user_balance,balance_num) = lines1.strip().split(':') 21 if user_balance == 'Your balance': 22 balance_num = int(balance_num) 23 print("%s:%d"%(user_balance,balance_num)) 24 break 25 26 #第1次登錄要輸入工資 27 else: 28 balance_num = input("请输入你的工资:") 29 balance_num = int(balance_num) 30 31 #打印商品信息 32 with open(shopping_info_file, 'r+') as shopping_info: 33 for lines2 in shopping_info: 34 (product, price) = lines2.strip().split(':') 35 price = int(price) 36 shopping_list.append((product, price)) 37 38 #While循環 39 while True: 40 for index,item in enumerate(shopping_list): 41 print(index,item) 42 choice = input("Your choice is?>>>") 43 if choice.isdigit(): 44 choice = int(choice) 45 if choice >=0 and choice < len(shopping_list): 46 P_list = shopping_list[choice] 47 if balance_num >= P_list[1]: 48 shopping_cart.append(P_list) 49 balance_num -=P_list[1] 50 print("你选择了：%s,价格:%d,你的余额:\033[31;1m%d\033[0m" % (P_list[0], P_list[1], balance_num)) 51 else: 52 print("\033[41;1m你选择了：%s,价格:%d,你的余额:%d,不够支付请充值!\033[0m" % (P_list[0], P_list[1], balance_num)) 53 else: 54 print("商品%s不存在" % choice) 55 elif choice == 'q': 56 #針對登錄過的用戶執行以下代碼 57 if os.path.exists(buy_info_file): 58 buy_info_add = open('I:\pythontest\BuyInfoNew.txt','w') 59 buy_info_add.close() 60 with open('I:\pythontest\BuyInfoNew.txt', 'r+') as buy_info_new,open('I:\pythontest\BuyInfo.txt', 'r') as buy_info_old: 61 buy_info_new.seek(0) 62 print("你的余额是：%d" % balance_num) 63 buy_info_new.write("Your balance:%d \n"%balance_num) 64 print("------------shopping list(%s)-----------\n" % time_record) 65 buy_info_new.write("------------shopping list(%s)-----------\n"%time_record) 66 for line in shopping_cart: 67 print(line) 68 buy_info_new.write("%s:%s\n"%(line[0],line[1])) 69 buy_info_new.write("-----------------------end---------------------------\n") 70 buy_info_old.seek(0) 71 for line in buy_info_old: 72 buy_info_new.write(line) 73 os.remove('I:\pythontest\BuyInfo.txt') 74 os.rename('I:\pythontest\BuyInfoNew.txt','I:\pythontest\BuyInfo.txt') 75 #新用戶執行以下代碼 76 else: 77 buy_info_add = open('I:\pythontest\BuyInfo.txt', 'w') 78 buy_info_add.close() 79 with open('I:\pythontest\BuyInfo.txt', 'r+') as buy_info_old: 80 buy_info_old.seek(0) 81 print("你的余额是：%d" % balance_num) 82 buy_info_old.write("Your balance:%d \n"%balance_num) 83 print("------------shopping list(%s)-----------\n" % time_record) 84 buy_info_old.write("------------shopping list(%s)-----------\n"%time_record) 85 for line in shopping_cart: 86 print(line) 87 buy_info_old.write("%s:%s\n"%(line[0],line[1])) 88 buy_info_old.write("-----------------------end---------------------------\n") 89 exit() 90 else: 91 #非數字選擇提示錯誤 92 print("Invalid choice,pls rechoice.Tks!")
