for实例

 1 #-*- coding:utf-8 *-*
 2 salary = 5000
 3 
 4 shop_list = [('iphone',9000),('mac book',10000),('python book',90),('coffee',32),
 5              ('bicycle',1500)]
 6 
 7 money = input("请输入您的现金总数：")
 8 money = int(money)
 9 have_buy_commodity = []
10 while True:
11     for i, v in enumerate(shop_list, 1):
12         print(i, v)
13 
14     query_buy_shop = input("请输入要购买的商品编号，q[退出]：")
15 
16     if query_buy_shop.isdigit():
17         query_buy_shop = int(query_buy_shop)
18 
19         if query_buy_shop >=1 and query_buy_shop <=5:
20             spend_money = shop_list[query_buy_shop-1]
21             buy_commodity = shop_list[query_buy_shop-1][0]
22             money = money - spend_money[1]
23             have_buy_commodity.append(buy_commodity)
24             if money < 0:
25                 print("您的余额不足！")
26                 print('--------Shop List--------')
27                 print(have_buy_commodity)
28                 print('--------------------------')
29                 break
30             else:
31                 print("您的余额为%s元!"%money)
32 
33 
34 
35 
36 
37         elif query_buy_shop == 'q':
38             print("退出成功！")
39             # print('--------Shop List--------')
40             # print(have_buy_commodity)
41             # print('--------------------------')
42 
43         else:
44             print("输入的字符非法,请重新选择")