IMHO: If you're new to Python and just trying to learn the language, I'd suggest sticking to Python 2.x for now, as the vast majority of Python material out there still use and refer to Python 2.x syntax. IMHO it'll be a lot easier learning and coping with what's changed in Python 3 only once you are already comfortable with Python 2.x syntax, rather than trying to use materials and books referencing 2.x on 3.x and then consequently running into unexpected issues as above, and never being sure whether issues you run into is due to some mistake on your part or a difference between 2.x and 3.x.
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