I suggest to the author that they rephrase the title to something like "...Theory in Python Part 3..." to make it clear that this is the third installment in a series, not specific to Python version 3.
Yes. I was thinking, “I’ve never seen Python 3 written as Python III before”.
Interesting point, that hadn't occurred to me. Luckily that won't be a problem for the other parts. I updated it to III which hopefully should make it a little more clear. The title is so long already!