It will take you an hour at most to read up on all the significant changes in Python 3. Its not like learning Scala or Perl at all. It just cuts some things that have been depreciated for years, makes everything more consistently iterable, adds some nice new comprehensions and literals, modifies certain bits of metaprogramming, and a few other smaller changes. The hardest thing for me was remembering that print is a function in 3, and needs parens.