python3 questions

[josnatalie]

upon installing python and python3 and then verifying which versions were installed.
python version was not 2.7.17 instead Python 2.7.16 (default, Apr 17 2020, 18:29:03
as for python3 was not 3.8.5 instead Python 3.7.3 (default, Apr 24 2020, 18:51:23)
how do i insure the correct python was installed. Im wondering if this is where i am messing up.

When I attempt to finish Usage I meet the same error that others are talking about with the following:
ModuleNotFoundError: No module named 'Cocoa'
even after running pip3 install -r requirements.txt
it stated that all of the requirements were satisfied.

incase I needed to make this clear, if I haven't already, I am a total newb and a bad one at that. Just trying to figure all of this out