购物车程序更新：
更新商家入口，实现以下功能：
1. 商家能够修改商品价格；
2. 商家能够下线商品；
3. 商家能够增加商品；
4. 商品信息存在文件中
1 # -*- coding:utf-8 -*- 2 # LC 3 product_list = [] 4 product_line = [] 5 count = 0 6 7 with open("product_list","r") as f: #打开商家货品清单文件 8 for item in f: 9 product_line = item.rstrip().split(",") #将每行赋值给成一个列表，以“，”区分 10 product_list.append(product_line) #将每行的列表加入product_list列表中 11 12 print("This is your production".center(50,"-")) #打印列表 13 for i in product_list: 14 print(count,i) 15 count+=1 16 17 #提供增加商品，修改商品价格，删除商品功能 18 while True: 19 select = input("Please input you selection,'a' to add,'m' to modified the price,'d' to Delete,'q' to quit :") 20 count = 0 21 if select == 'a': 22 add_product = input("Please input new product name:") 23 add_price = input("Please input new product price:") 24 new_product = [add_product,add_price] #将新添加的商品赋值成列表 25 product_list.append(new_product) #向产品清单列表中插入新添加的商品 26 with open("product_list","a") as f_add: #将添加的商品写入文件中，以追加的方式 27 f_add.writelines(product_list[-1][0]+","+product_list[-1][1]+" ") 28 print(" 33[1;31mThis is your new production list 33[0m".center(50,"-")) 29 for i in product_list: #打印新的产品清单 30 print(count,i) 31 count+=1 32 elif select == 'm': 33 modify_index = input("Please input index of the item which you want to modify:") #输入要修改价格的产品序号 34 modify_index = int(modify_index) 35 length = product_list.index(product_list[-1]) #判断输入的修改价格产品序号是否再产品清单范围 36 if 0 <= modify_index <= length: 37 new_price = input("Please input the new price:") #输入新的价格 38 product_list[modify_index][1]=new_price #将新的价格修改至产品清单列表中 39 with open("product_list","w") as f_modify: #想修改的产品清单列表写入文件中 40 for i in product_list: 41 f_modify.writelines(i[0]+","+i[1]+" ") 42 print(" 33[1;31mThis is your new production list 33[0m".center(50,"-")) 43 for i in product_list: #打印新的产品清 44 print(count,i) 45 count+=1 46 else: 47 print("Your select is invalid, Please try again!") #如果输入的序号不在范围内，则报错重新来 48 elif select == 'd': #删除商品 49 delete_index = input("Please input index of the item which you want to delete:") 50 delete_index = int(delete_index) 51 length = product_list.index(product_list[-1]) #判断输入的删除序号是否再产品清单范围 52 if 0 <= delete_index <= length: 53 product_list.pop(delete_index) #从产品清单中删除制定的产品 54 with open("product_list","w") as f_del: 55 for i in product_list: 56 f_del.writelines(i[0]+","+i[1]+" ") #将新的产品清单写入文件中 57 print(" 33[1;31mThis is your new production list 33[0m".center(50,"-")) 58 for i in product_list: 59 print(count,i) 60 count+=1 61 else: 62 print("Your select is invalid, Please try again!") 63 64 elif select == "q": 65 print("You have been quit!") 66 break 67 else: 68 print("invalid input,please input again!")
pic,2
rice,3
water,32
phone,5000
pia,300
更新用户购买程序，实现以下功能：
1. 用户第一次购买输入薪资；
2. 用户购买商品信息写入文件；
3. 用户再次购买先读取之前的购买清单文件，查看余额；
1 # -*- coding:utf-8 -*- 2 # LC 3 import os 4 product_list = [] #定义商品清单列表 5 product_line = [] #定义商品清单中每行的列表 6 user_buy_list = [] #定义用户已经购买商品列表 7 user_buy_product = [] #定义用户购买单个商品的列表 8 with open("product_list","r") as f_production: #读取商品清单列表 9 for item_production in f_production: 10 product_line = item_production.rstrip().split(",") 11 product_list.append(product_line) 12 13 if os.path.getsize("shopping_list") == 0: #判断是否为第一次消费，如果消费清单文件为空，则第一次消费 14 salary = input("Please input your salary:") 15 balance = int(salary) #将余额定义为薪资 16 else: 17 length = len(open("shopping_list","rU").readlines()) #如果不是第一次消费，计算消费清单文件行数，提取消费列表 18 count = 0 19 with open("shopping_list", "r") as f_shopping_list: 20 for shopping_item in f_shopping_list: 21 count +=1 22 if 2 <= count <= length-2: #去除第一行和最后两行，将消费清单中已购买的商品提取出来 23 shopping_item = shopping_item.strip().split() #将购买的商品转换为列表，包含商品，单价，数量 24 user_buy_list.append(shopping_item) #将已经购买的商品记录至用户消费清单列表中 25 elif count == length: 26 shopping_item = shopping_item.strip().split() 27 balance = int(shopping_item[-1]) #如果非第一次消费，则余额为消费清单文件中的余额，提取出来 28 while True: 29 print("This is the production list".center(50, "-")) 30 count = 0 31 for i in product_list: 32 print(count, i) 33 count += 1 34 user_select = input("Your balance is %d, 's' to start to shopping,'q' to quit : "%(balance)) 35 if user_select == 's': 36 user_buy_product = [] 37 user_select_index = input("Please select the index of the one you want to buy:") #输入要购买的商品 38 user_select_count = input("Please input the number how many you want to buy:") #输入要购买的商品数量 39 user_select_index = int(user_select_index) 40 user_select_count = int(user_select_count) 41 unit_price = int(product_list[user_select_index][1]) #要购买的商品单价 42 product_price = unit_price * user_select_count #购买的商品金额，即单价乘以总价 43 if product_price <= balance: 44 user_buy_product.append(product_list[user_select_index][0]) #将购买的商品的名称插入新的单个列表中 45 user_buy_product.append(product_list[user_select_index][1]) #将购买的商品的单价插入新的单个列表中 46 user_buy_product.append(str(user_select_count)) #将购买的商品的数量插入新的单个列表中 47 user_buy_list.append(user_buy_product) #将新购买的商品，包含名称，单价，数量插入用户购买清单中 48 balance = balance - product_price #将金额出去已经购买的商品金额，以免余额不足 49 else: #购买的商品和数量，余额不足 50 print(" 33[1;31mYour choice is out of your money! 33[0m") 51 continue 52 elif user_select == 'q': 53 break 54 else: 55 print("invalid input ,try again") 56 continue 57 58 #统计用户购买商品的总金额和消费余额 59 total_price = 0 60 for i in user_buy_list: 61 user_buy_product_price = int(i[1]) * int(i[2]) #用户购买的单个商品的总额，即单件商品的单价乘以数量 62 total_price = total_price + user_buy_product_price #统计消费总金额 63 total_consumption = ["Total_Consumption:"] 64 balance_list = ["Your balance:"] #消费清单上记录余额信息 65 balance_list.append(balance) 66 total_consumption.append(total_price) 67 user_buy_list.append(total_consumption) #将总消费金额信息插入用户消费清单中 68 user_buy_list.append(balance_list) #将余额信息插入用户消费清单中 69 70 #将用户购买的商品写入消费清单文件中，并记录总价和余额 71 with open("shopping_list","w") as f_buy: 72 f_buy.writelines("product".center(15,"-")+"price".center(15,"-")+"count".center(15,"-")+" ") 73 for i in user_buy_list: 74 if len(i) == 3: #将商品写入 75 f_buy.writelines(str(i[0]).center(15," ")+str(i[1]).center(15," ")+str(i[2]).center(15," ")+" ") 76 else: #将余额和消费总额写入 77 f_buy.writelines(str(i[0]).ljust(30, " ") + str(i[1]).center(15, " ") + " ") 78 79 #打印最终购买清单 80 print("This is your purchase list".center(45,"-")) 81 with open("shopping_list","r") as f_read: 82 for i in f_read: 83 print(i.strip(" "))
购买清单文件
----product---------price----------count-----
pic 2 20
rice 3 50
water 32 300
phone 5000 2
pia 300 50
phone 5000 2
phone 5000 1
Total_Consumption: 49790
Your balance: 210