Python 2 or 3 for Hacking?

So I've been looking @The Defalts python tutorial and it was all going so well until lesson 4: Basic user Input. I figured I must be doing something wrong and then I realised Defalt was using 2.7 and I'm on 3.5. so the print functions have changed. I'm confused on if 2 or 3 is more useful in the context of hacking. I'm new to programming (I wanted to learn programming before pentesting so I'm not a Skid)

But if 3 is being developed in the future and majour 2 developments are no longer on the horizon (according to the wiki) then won't it be better to learn 3