How to keep a Python script output window open?

Question

I have just started with Python. When I execute a python script file on Windows, the output window appears but instantaneously goes away. I need it to stay there so I can an

Answer 1

In python 2 you can do it with: raw_input()

>>print("Hello World!")    
>>raw_input('Waiting a key...')

In python 3 you can do it with: input()

>>print("Hello world!")    
>>input('Waiting a key...')

Also, you can do it with the time.sleep(time)

>>import time
>>print("The program will close in 5 seconds")
>>time.sleep(5)