How do you toggle between Python 2 and Python 3

I am on WIndows 8.1. I have set my Edit->Preferences-Language Python/Python3 values to the appropriate executables. Now I would like to select which one to use to run a Python file I am editing. I cannot figure out how to do that. Or, in this particular case, I want to run Python 3, but it is running Python 2.x as it does not complain about a 2.7 version of the print statement.

First you should configure both Python languages in Preferences - Languages.
Second you should change file type from Python to Python 3 here
After that you will able to run Python 3 debugging by press F5 (or your custom hotkey) or from Debug - Go/Continue

Thanks, that did it!