当我尝试用Python编写一个简单的程序时，窗口会立即消失。这是代码：
Python 2.7.10 (default, May 23 2015, 09:40:32) [MSC v.1500 32 bit (Intel)] on win32
Type "copyright", "credits" or "license()" for more information.
>>> print('hello')
hello
>>> print('hello')
hello
>>> raw_input('press enter to close')
press enter to close