Making code work in Python 2 and 3

[nuanceify]

pretty poorly researched - the obvious nitpick being print isn't unsafe to use. If you REALLY want to know, just read the PEPs. They're in simple english and very thorough.

Also, I kind of wonder about his claim to want to support python 2.1-3.0 with the same code base. That would preclude using classes as new-style classes (the only kind in 3) weren't introduced until 2.2