#!/usr/bin/env python
#-*-coding=utf-8 -*-
#AUTHOR:duwentao
product_list = [
('Iphone',5000),
('book',10),
('watch',10600),
('bike',800),
]
shopping_list=[]
#判断工资是否为数字
salary = input("请输入你的工资：")
if salary.isdigit():
salary = int(salary)
while True:
for item in product_list:
print (product_list.index(item),item)
user_choice = input('请输入你要购买的商品号：')
if user_choice.isdigit():
user_choice = int(user_choice)
if user_choice >= 0 and user_choice < len(product_list):
p_item = product_list[user_choice]
if p_item[1] > salary:
print('余额不足')
else:
shopping_list.append(item)
salary -= p_item[1]
print('你已经购买了%s,您的余额为%s' %(item,salary))
else:
print('你购买的商品不存在')
elif user_choice == 'q':
print ('----shopping list----')
for p in shopping_list:
print(p)
print('你的余额为',salary)
exit()
else:
print ("输入有误，请重新编号")
print ("正在退出")
exit()
老男孩培训练习购买商品
原文：http://blog.51cto.com/tdcqvip/2053893
