Anyone know what version of Python is this in? It's hard to tell since it's not mentioned in the book. Try doing import sys on the example frames doesn't work either. Trying to see if it aligns with the version some of us use at work.
Also, in the "Review of Basic Python" chapter, it explicitly links to the official Python 3 docs: http://interactivepython.org/runestone/static/pythonds/Intro...