The python.org tutorial[0] is available in both 2 & 3, and is a perfectly great, but often overlooked, resource for learning the language.

[0]: https://docs.python.org/3/tutorial/

It is a great tutorial for someone with some programming experience but for complete beginners it's not adequate.

This is sadly true, although as Lennart's guide makes it clear many of those can trivially be updated to run on both. I'm hoping the next year leads to a lot of the simple updates happening so tutorial code can run against both — with `from __future__ import absolute_import, division, print_function, unicode_literals` quite a few programs can easily be single-source using only stock Python 2.7 / 3.4 without needing to introduce something like six.

The code in Learn Python the Hard Way is all really easy to port to Python 3 since it's written for new programmers, that said. New programmers won't know that.

Udacity is stuck with 2.7 until GAE supports Python 3.