The Differences Between Python 2 and Python 3

In Python 3, you can't do a relative import within a package. That is one place that might break in Python 2,. I'm not really aware of much else though. You know, having been using 3 for a while, I haven't really noticed anything that would break across languages like that. So if you want to do a deployment, you just kill the old one and then it will automatically respawn itself at some point.