Python-文件操作-之优化购物车

#此次购物车优化，主要使用了文件操作的相关方法，有买家入口，和商家入口

一、买家入口

1、买家第一次启动程序输入金额，金额会记录到文件里，再登录就读取文件里保存的金额，买家可以购买商品，按 ‘q’ 退出后显示购买的商品和余额，并保存购买过的商品和余额。
 1 global data
 2 global userinformation
 3 money=''
 4 data='data.txt'
 5 userinformation='userinformation.txt'
 6 mgoods=[]
 7 exit_flag = False
 8 def shuoppxit(money):
 9     if money.isdigit():
10         while not exit_flag:
11             for index, item in enumerate(goods):
12                 print(index, item)
13             numbres = input("输入购买商品的序号：")
14             if numbres.isdigit():
15                 numbres = int(numbres)
16                 if numbres< len(goods) and numbres >=0:
17                     money = int(money)
18                     numbres_goods=goods[numbres][1]
19                     if money >= numbres_goods:
20                         money=money-numbres_goods
21                         goods[numbres].append('余额')
22                         goods[numbres].append(money)
23                         print(goods[numbres])
24                         mgoods.append(goods[numbres])
25                         f = open(userinformation, 'w+', encoding='utf-8')
26                         f.write(str(mgoods))
27                         f.close()
28                         print('购买商品成功:'+goods[numbres][0])
29                         print('剩余金钱：\033[31;1m %s \33[0m' % money )
30                     else:
31                         print('余额不足！')
32             elif numbres=='q' or numbres=='Q':
33                 print('你购买的商品如下：')
34                 f = open(userinformation, 'r', encoding='utf-8')
35                 data2 = f.read()
36                 goods2 = eval(data2)
37                 for i in goods2:
38                     print(i)
39                 break
40             else:
41                 print('输入错误！！')
42     else:
43         print('输入错误！！,重新输入')
44 
45 f = open(data,'r',encoding='utf-8')
46 data2 = f.read()
47 goods = eval(data2)
48 
49 f = open(userinformation,'r',encoding='utf-8')
50 data2 = f.read()
51 if data2 !='':
52     usernames = eval(data2)
53     money= usernames[0][3]
54     money=str(money)
55     shuoppxit(money)
56 else:
57     money = input("输入你的钱：")
58     shuoppxit(money)

 

二、商家入口

1、商家可以添加商品，和修改商品价格
global data
money=''
data='data.txt'
mgoods=[]
exit_flag = False

f = open(data,'r',encoding='utf-8')
data2 = f.read()
goods = eval(data2)
print(goods)
while not exit_flag:
    choice=input('1、添加商品 2、修改价格：')
    if choice.isdigit():
        if choice=='1':
            name=input('输入商品名：')
            price=input('输入价格：')
            mgoods.append(name)
            mgoods.append(price)
            goods.append(mgoods)
            f = open(data, 'w', encoding='utf-8')
            f.write(str(goods))
            f.close()
            print(goods)
        else:
            for index, item in enumerate(goods):
                print(index, item)
                numbres = input("输入修改商品的序号：")
                if numbres.isdigit():
                    numbres = int(numbres)
                    if numbres < len(goods) and numbres >= 0:
                        jiage = input("输入修改商品价格：")
                        if jiage.isdigit():
                            jiage = int(jiage)
                            goods[numbres][1]= jiage
                            f = open(data, 'w', encoding='utf-8')
                            f.write(str(goods))
                            f.close()
                            print(goods)
                            exit_flag=True

 



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posted @ 2020-03-01 14:48  Kong-Ming  阅读(376)  评论(0)    收藏  举报