[wavetossed]

I still thing that Python 2.7.2 is the only way to go for development unless you already know Python and its ecosystem well enough to know that 3.x will work for you.

That said, I try to use any backported 3.0 features such as .format for string formatting. And for beginners, I heartily recommend using the 'six' module. That way when you need to move to 3.0, porting your code or your skills, will be easy-peasy.