开发笔记:python实现购物车程序

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(‘,‘,‘‘) +‘
‘
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(‘
‘)
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(‘
‘)
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(‘
‘)
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 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 33[31;1m%s33[0m" %(product_item[0],money))
68 else:
69 print("33[41;1m你的余额不足，请及时充值...33[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...‘)