[Tutor] combining Python 2.x and Python 3

[Andre Engels]

I have an open source project I have done some work on, which is
programmed in Python 2.3-2.6. I would like to change it so that it can
be run under both Python 3 and Python 2.x. Two questions for that:
* is there a place where I can find an overview of what to do to make
such a change?
* is there a way to check, on one computer, the code under both
versions (I am using Windows Vista, in case it matters)?

-- 
André Engels, andreengels at gmail.com