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
# -*- coding:utf-8 -*-
# LC
product_list = []
product_line = []
count = 0 with open("product_list","r") as f: #打开商家货品清单文件
for item in f:
product_line = item.rstrip().split(",") #将每行赋值给成一个列表，以“，”区分
product_list.append(product_line) #将每行的列表加入product_list列表中 print("This is your production".center(50,"-")) #打印列表
for i in product_list:
print(count,i)
count+=1 #提供增加商品，修改商品价格，删除商品功能
while True:
select = input("Please input you selection,'a' to add,'m' to modified the price,'d' to Delete,'q' to quit :")
count = 0
if select == 'a':
add_product = input("Please input new product name:")
add_price = input("Please input new product price:")
new_product = [add_product,add_price] #将新添加的商品赋值成列表
product_list.append(new_product) #向产品清单列表中插入新添加的商品
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
f_add.writelines(product_list[-1][0]+","+product_list[-1][1]+"\n")
print("\033[1;31mThis is your new production list\033[0m".center(50,"-"))
for i in product_list: #打印新的产品清单
print(count,i)
count+=1
elif select == 'm':
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
modify_index = int(modify_index)
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
if 0 <= modify_index <= length:
new_price = input("Please input the new price:") #输入新的价格
product_list[modify_index][1]=new_price #将新的价格修改至产品清单列表中
with open("product_list","w") as f_modify: #想修改的产品清单列表写入文件中
for i in product_list:
f_modify.writelines(i[0]+","+i[1]+"\n")
print("\033[1;31mThis is your new production list\033[0m".center(50,"-"))
for i in product_list: #打印新的产品清
print(count,i)
count+=1
else:
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
elif select == 'd': #删除商品
delete_index = input("Please input index of the item which you want to delete:")
delete_index = int(delete_index)
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
if 0 <= delete_index <= length:
product_list.pop(delete_index) #从产品清单中删除制定的产品
with open("product_list","w") as f_del:
for i in product_list:
f_del.writelines(i[0]+","+i[1]+"\n") #将新的产品清单写入文件中
print("\033[1;31mThis is your new production list\033[0m".center(50,"-"))
for i in product_list:
print(count,i)
count+=1
else:
print("Your select is invalid, Please try again!") elif select == "q":
print("You have been quit!")
break
else:
print("invalid input,please input again!")
商家入口程序
pic,2
rice,3
water,32
phone,5000
pia,300
货品清单文件
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；
# -*- coding:utf-8 -*-
# LC
import os
product_list = [] #定义商品清单列表
product_line = [] #定义商品清单中每行的列表
user_buy_list = [] #定义用户已经购买商品列表
user_buy_product = [] #定义用户购买单个商品的列表
with open("product_list","r") as f_production: #读取商品清单列表
for item_production in f_production:
product_line = item_production.rstrip().split(",")
product_list.append(product_line) 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
salary = input("Please input your salary:")
balance = int(salary) #将余额定义为薪资
else:
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
count = 0
with open("shopping_list", "r") as f_shopping_list:
for shopping_item in f_shopping_list:
count +=1
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
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
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
elif count == length:
shopping_item = shopping_item.strip().split()
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
while True:
print("This is the production list".center(50, "-"))
count = 0
for i in product_list:
print(count, i)
count += 1
user_select = input("Your balance is %d, 's' to start to shopping,'q' to quit : "%(balance))
if user_select == 's':
user_buy_product = []
user_select_index = input("Please select the index of the one you want to buy:") #输入要购买的商品
user_select_count = input("Please input the number how many you want to buy:") #输入要购买的商品数量
user_select_index = int(user_select_index)
user_select_count = int(user_select_count)
unit_price = int(product_list[user_select_index][1]) #要购买的商品单价
product_price = unit_price * user_select_count #购买的商品金额，即单价乘以总价
if product_price <= balance:
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
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
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
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
balance = balance - product_price #将金额出去已经购买的商品金额，以免余额不足
else: #购买的商品和数量，余额不足
print("\033[1;31mYour choice is out of your money!\033[0m")
continue
elif user_select == 'q':
break
else:
print("invalid input ,try again")
continue #统计用户购买商品的总金额和消费余额
total_price = 0
for i in user_buy_list:
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
total_price = total_price + user_buy_product_price #统计消费总金额
total_consumption = ["Total_Consumption:"]
balance_list = ["Your balance:"] #消费清单上记录余额信息
balance_list.append(balance)
total_consumption.append(total_price)
user_buy_list.append(total_consumption) #将总消费金额信息插入用户消费清单中
user_buy_list.append(balance_list) #将余额信息插入用户消费清单中 #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
with open("shopping_list","w") as f_buy:
f_buy.writelines("product".center(15,"-")+"price".center(15,"-")+"count".center(15,"-")+"\n")
for i in user_buy_list:
if len(i) == 3: #将商品写入
f_buy.writelines(str(i[0]).center(15," ")+str(i[1]).center(15," ")+str(i[2]).center(15," ")+"\n")
else: #将余额和消费总额写入
f_buy.writelines(str(i[0]).ljust(30, " ") + str(i[1]).center(15, " ") + "\n") #打印最终购买清单
print("This is your purchase list".center(45,"-"))
with open("shopping_list","r") as f_read:
for i in f_read:
print(i.strip("\n"))
用户端程序
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
购买清单文件