[dagw]

If it's scientific, go with 3, most of those tools are newer.

Which tools? I use python for scientific computing and I can't think of any tool that I use where the python 3 version (if it exists) is newer/better than the python 2 version.

[baldfat]

numpy and pandas are both Python 3.

Newer and Better is a totally different question and this is why we have the Python 2 or 3 debate.

[dagw]

Sure, but as far as I know numpy and pandas for python2 and python 3 are exactly the same. I don't think there is a newer python 3 version of either.

[xorcist]

I only knew they were in active development and supposed that's were the action is, it's not my area at all. Most scientific use is also with version 2 then. Then I can't think of any problem domain were you should go with version 3 in practice. I would be interested in what the other recommendations here are based on, other than "I like it for my own stuff".