[joeclef]

I believe it is Python 2.7. But I could be wrong.

[danso]

Even if it is, it follows conventions compatible with 3.x, e.g. using parentheses with print statements.

Also, in the "Review of Basic Python" chapter, it explicitly links to the official Python 3 docs: http://interactivepython.org/runestone/static/pythonds/Intro...