终于，终于，在自己这几天无数次跳坑之后，终于爬出来了。把里面所有的问题都修正了。

　　程序显的有些繁琐，但是对于我这个水平来说，已经是很高兴了，毕竟学了并不是很久，供新手学习还是有些帮助的。自己肯定也会越来越努力，好好学习，加油！

1 __Author__ = "Zhang Peng"  2 product_list = [  3     ('Iphone', 5888),  4     ('笔记本', 12888),  5     ('手表', 10600),  6     ('电视', 3888),  7     ('书', 58),  8 ]  9  10 id_list = ["商家", "用户", "shangjia", "yonghu"] 11 id_shopping = input("Please input your ID:\n") 12  13 exit_flag = False 14  15 if id_shopping == "shangjia": 16     choice = input("你是否想添加\修改商品？添加商品输入'1'，修改商品输入'2',退出输入'q':\n") 17     if choice == "1": 18         while not exit_flag: 19             name = input("请输入您想添加的商品名称：\n") 20             name2 = input("请输入您添加商品的价格：\n") 21             if name == "q" or name2 == "q": 22                 exit_flag = True 23             else: 24                 product_list.append((name, name2), ) 25  26     elif choice == "2": 27         while not exit_flag: 28             name3 = input("请输入您想修改价格的商品名称：\n") 29             name4 = input("请输入您想要修改的价格：\n") 30  31             if name3 == "q" or name4 == "q": 32                 exit_flag = True 33             else: 34                 a = product_list.index(name3) 35                 product_list.remove(name3) 36                 product_list.index((name3, name4)) 37  38     else: 39         if choice == "q": 40             exit_flag = True 41     print(product_list) 42  43  44 elif id_shopping == "yonghu": 45     shopping_list=[] 46     with open("shopping_list.txt","r",encoding="utf8") as f_shop1: 47         print("你的购物车里已经有：") 48         print(f_shop1.read()) 49     with open("salary.txt","r",encoding="utf8") as f_salary1: 50         salary = f_salary1.read() 51         print(salary) 52     if salary.isdigit():  # isdigit 是判断输入的是不是一个数字 53         salary = int(salary) 54         while True: 55             print("我们有一下商品：\n") 56             for index, item in enumerate(product_list): 57                 print(index, item) 58             user_choice = input("请问你还想买什么？:\n") 59             if user_choice.isdigit(): 60                 user_choice = int(user_choice) 61                 if user_choice < len(product_list) and user_choice > 0: 62                     p_item = product_list[user_choice] 63                     if p_item[1] < salary:  # 买不起 64                         shopping_list.append(p_item) 65                         salary -= p_item[1] 66                         print("您买的商品已经加入购物车") 67                     else: 68                         print("没钱别嘚瑟了") 69                 else: 70                     print("没有您要的商品") 71             elif user_choice == 'q': 72                 print("----------shopping list----------") 73                 for p in shopping_list: 74                     print(p) 75                     with open("shopping_list.txt", "a", encoding="utf8") as f_shop2: 76                         f_shop2.write(str(p)) 77                 print("你还剩余", salary) 78                 with open("salary.txt", "w", encoding="utf8") as f_salary2: 79                     f_salary2.write(str(salary)) 80                 exit() 81  82             else: 83                 print("输入错误") 84  85 else: 86     shopping_list = [] 87     salary = input("请输入你的月薪：\n") 88     if salary.isdigit():  # isdigit 是判断输入的是不是一个数字 89         salary = int(salary) 90         while True: 91             for index, item in enumerate(product_list): 92                 print(index, item) 93             user_choice = input("请问你想买什么？:\n") 94             if user_choice.isdigit(): 95                 user_choice = int(user_choice) 96                 if user_choice < len(product_list) and user_choice > 0: 97                     p_item = product_list[user_choice] 98                     if p_item[1] < salary:  # 买不起 99                         shopping_list.append(p_item)100                         salary -= p_item[1]101                         print("您买的商品已经加入购物车")102                     else:103                         print("没钱别嘚瑟了")104                 else:105                     print("没有您要的商品")106             elif user_choice == 'q':107                 print("----------shopping list----------")108                 for p in shopping_list:109                     print(p)110                     with open("shopping_list.txt", "a",encoding="utf8") as f_shop3:111                         f_shop3.write(str(p))112                 print("你还剩余", salary)113                 with open("salary.txt", "w",encoding="utf8") as f_salary3:114                     f_salary3.write(str(salary))115                 exit()116 117             else:118                 print("输入错误")

 　　希望能得到打什么的评论，这才是我最大的学习动力！谢谢！