python实现购物车程序

使用python3实现的简单购物车程序

用户入口
1、第一次需要输入自己的金额，下次购买会记录上一次所剩的余额
2、用户只需要输入对应商品前面的序号即可将商品添加进购物车
3、能够记录用户购买商品的历史记录，并每次退出程序后显示总的购买情况

商家入口
1、商家需要通过账号验证进入
2、商家能够对商品进行添加以及修改商品的价格

可以自行考虑一些其余的功能添加上去

  1 #!/usr/bin/env python
  2 #coding:utf-8
  3
  4 import os
  5
  6 def text_save(filename, data):  ##定义函数将列表存入到文件里面
  7     file = open(filename,‘w‘)
  8     for i in range(len(data)):
  9         s = str(data[i]).replace(‘[‘,‘‘).replace(‘]‘,‘‘)
 10         s = s.replace("‘",‘‘).replace(‘,‘,‘‘) +‘\n‘
 11         file.write(s)
 12     file.close()
 13
 14 size = os.path.getsize(‘shopping.txt‘)  #判断存商品的文件是否为空，如果为空，则使用自定义的商品初始值
 15 if size == 0:
 16      shopping = [[‘phone‘,2800],[‘snacks‘,200],[‘watch‘,1200],[‘cloths‘,500]]
 17 else:
 18     shopping = []
 19     with open(‘shopping.txt‘,‘r‘) as f:
 20         for data in f.readlines():
 21            shopping.append(data.split(‘ ‘))
 22     for data2 in range(len(shopping)):
 23         shopping[data2][1] = shopping[data2][1].rstrip(‘\n‘)
 24         shopping[data2][1] = int(shopping[data2][1])
 25
 26
 27 shopping_list = []  #定义用户购买的商品列表
 28
 29
 30 with open(‘shopping_cart.txt‘,‘r‘) as f1:  #打开存取用户商品的文件，并将已购买的商品读取保存到列表里
 31     for j in f1.readlines():
 32         shopping_list.append(j.split(‘ ‘))
 33 for j2 in range(len(shopping_list)):
 34     shopping_list[j2][1] = shopping_list[j2][1].rstrip(‘\n‘)
 35
 36
 37 with open(‘user.txt‘,‘r‘) as f: #需要事先在文件里面写上验证的用户，这里只定义了一个admin用户，用于区分是用户还是商家
 38     userlist = f.readlines()
 39 for i in range(len(userlist)):
 40     userlist[i] = userlist[i].strip(‘\n‘)
 41
 42
 43 role  = input(‘if or not  you are admin?(y|n)：‘)  #简单判断是进入到用户入口还是商家入口
 44
 45 #用户入口
 46 if role  == ‘n‘:
 47     size = os.path.getsize(‘salary.txt‘) #若保存工资的文件为空,则需要用户手动输入自己的余额,否则直接读取里面保存的余额
 48     if size == 0:
 49         money = input(‘please input your RMB:‘)
 50     else:
 51         with open(‘salary.txt‘,‘r‘) as f3:
 52             money = f3.read()
 53     flag1 = False
 54     if money.isdigit():
 55         money = int(money)
 56         while not flag1:
 57             for index,item in enumerate(shopping):#获取商品的列表以及对应的下标,用户选择对应的序号即可添加商品到购物车
 58                 print(index,item)
 59             product_choice = input("你需要选择什么商品>>>")
 60             if product_choice.isdigit():
 61                 product_choice = int(product_choice)
 62                 if product_choice < len(shopping) and product_choice >=0:#判断选择购买的商品是否在列表里存在
 63                     product_item = shopping[product_choice]
 64                     if product_item[1] <= money: #判断余额是否足够
 65                         shopping_list.append(product_item)
 66                         money -= product_item[1]
 67                         print("add [%s] into your shopping cart and Your remaining balance is \033[31;1m%s\033[0m" %(product_item[0],money))
 68                     else:
 69                         print("\033[41;1m你的余额不足，请及时充值...\033[0m")
 70                 else:
 71                     print("没有这个商品，请选择其余物品...")
 72
 73             elif product_choice == ‘q‘:
 74                 print(‘‘‘
 75     ----------------------
 76     你的购物车当前的商品有:‘‘‘)
 77                 for i in shopping_list:
 78                     print(i)
 79                 print("your remaining balance is",money)
 80                 flag1 = True
 81             else:
 82                 print("invalid input")
 83     with open(‘salary.txt‘,‘w‘) as f4:
 84         f4.write(str(money))
 85     text_save(‘shopping_cart.txt‘,shopping_list)
 86
 87
 88 #商家入口
 89 elif role == ‘y‘:
 90     flag = False
 91     i = 0
 92     while not flag:
 93         user = input(‘please input your admin user：‘)
 94         print(user,type(user))
 95         if user  in userlist:
 96             while not flag:
 97                 i = 0
 98                 change = input("do you want to modify shopping?(y|n)：")
 99                 if change == ‘y‘:
100                     while not flag:
101                         change1 = input("add shopping(1) or modify shopping price(2),(1|2|q)：")  #通过判断商家是需要添加商品还是修改商品价格,或者可以直接退出
102                         if change1 == ‘1‘:
103                             add_shop = input(‘please input shopping that you want to add!‘)
104                             shop_price = input(‘please input shopping price!‘)
105                             shopping.append([add_shop,shop_price])
106                         elif change1 == ‘2‘:
107                             for index1,item1 in enumerate(shopping):  #获取到需要修改的商品对应的列表和下标
108                                print(index1,item1)
109                             mod_shopping = input(‘what shopping price do you want to modify?‘)
110                             if mod_shopping.isdigit(): #判断输入的是否为数字,并且将字符串类型转换为int
111                                 mod_shopping = int(mod_shopping)
112                             change_shopping = shopping[mod_shopping][0]
113                             mod_price = input(‘how much do you want to change?‘)
114                             if mod_price.isdigit(): #默认输入的价格是str类型,需要转换为int
115                                 mod_price = int(mod_price)
116                             shopping[mod_shopping] = [change_shopping,mod_price]
117                         elif change1 == ‘q‘:
118                             print("exiting...")
119                             flag = True
120                         else:
121                             print("invalid option...")
122                 elif change == ‘n‘:
123                     print("正在退出管理商品终端...")
124                     flag = True
125                 else:
126                     pass
127         else:
128             print(‘您的验证错误，请重新输入正确的用户：‘)
129             i = i+1
130             if i >= 3:
131                 print(‘你已经连续输错了三次，将自动退出。。‘)
132                 flag = True
133     text_save(‘shopping.txt‘,shopping)
134
135 else:
136     print(‘invalid option...‘)

原文地址：https://www.cnblogs.com/wujiest/p/9693786.html