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To give another example, Ubuntu is moving towards Python 3 by default, the plan is to have it as the only pre-installed Python version by 18.04 LTS, which is only a year away.

https://wiki.ubuntu.com/Python

Oh absolutely. There's a few linux distros starting to ship python3 by default, which is great. It's happening far too slowly.

Speaking of speed, I hear 3.7 should finally be able to beat 2.7 for most benchmarks, which is pretty sweet.

There's a reason the python command points to Python 2: https://www.python.org/dev/peps/pep-0394/

https://www.python.org/dev/peps/pep-0394/#id16 It is anticipated that there will eventually come a time where the third party ecosystem surrounding Python 3 is sufficiently mature for this recommendation to be updated to suggest that the python symlink refer to python3 rather than python2 .