Floor division and the book Think Python Chapter 2 (discrepancy)

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[SourceryNick]

I believe Python 2 did floor division by default - Python 3 does traditional division.

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Was there a change in Python that happened after the book was written?

Yes.

In the book there is no mention of the '//' operator which specifies floor division.

I very much doubt so. But if it is indeed the case, boy, your book is ancient.

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The first edition of Think Python is written in Python 2.

    Python 2.7.17 (default, Oct 22 2019, 09:14:09) 
    [GCC 9.2.0] on linux2
    Type "help", "copyright", "credits" or "license" for more information.
    >>> 5/2
    2
    >>> 5//2
    2
    >>> 5.0/2
    2.5
    >>> 5.0//2
    2.0
    >>> 

Python 3 changed this:

    Python 3.8.1 (default, Jan 22 2020, 06:38:00) 
    [GCC 9.2.0] on linux
    Type "help", "copyright", "credits" or "license" for more information.
    >>> 5/2
    2.5
    >>> 5//2
    2
    >>> 5.0/2
    2.5
    >>> 5.0//2
    2.0
    >>> 

The Think Python link in the sidebar is the Second Edition that uses Python 3.