When I first learned Python, I learned Python 3 first because it was newer, and I figured everyone would be using it soon enough. Little did I know that Python 2 would continue to be supported for over ten years after that!
Some people make a big deal about figuring out "which" Python to learn - that's not really much of an issue, because Python 3 isn't so different from Python 2 that it's hard to pick up the other very quickly (especially given how much has been backported to 2.7). But it's unfortunate to see people continuing to write new code in Python 2.