Deprecated print statement (Python 2.x vs 3.x)

I was following the tutorial with Python 3 and stumbled upon a [SyntaxError following the print statement](http://stackoverflow.com/questions/25445439/what-does-syntaxerror-missing-parentheses-in-call-to-print-mean-in-python).
Not a huge deal, but it would probably be nice to provide the two alternatives, or at least some mention of the python version that the tutorial is based upon :smile: