学习了list，试写一段购物车程序

 1 #!/usr/bin/env python
 2 # -*- coding: utf-8 -*-
 3 # Author:Mgin
 4 shopping_car = []
 5 salary = int(input("your salary:"))
 6 goods_list = [["Watch",20000],["ThinkPad",8500],["IPhone",5800 ],["Suit",3700],["Boost shoes",1700],["Contact Lens",150],["Alex python",80],["Starbucks",30]]
 7 print("goods list：")
 8 for i in goods_list:
 9     print(goods_list.index(i),i)
10 while salary > 0:
11     add = int(input("add goods to your shopping car:"))
12     if add > int(len(goods_list)-1) or add < 0:
13         print("goods have not been found ")
14         stop = input("Do you want to continue:")
15         if stop != ‘n‘:
16             continue
17         else:
18             for i in shopping_car:
19                 print(i)
20             print("balance:", salary)
21             break
22     elif salary - goods_list[add][1] > 0:
23         salary = salary - goods_list[add][1]
24         shopping_car.append(goods_list[add])
25         print("added",goods_list[add][0],"to your shopping car.","\n","balance:",salary)
26         stop = input("Do you want to continue:")
27         if stop != ‘n‘:
28             continue
29         else:
30             for i in shopping_car:
31                 print(i)
32             print("balance:",salary)
33             break
34     else:
35         print("you have not enough money")
36         stop = input("Do you want to continue:")
37         if stop != ‘n‘:
38             continue
39         else:
40             for i in shopping_car:
41                 print(i)
42             print("balance:", salary)
43             break