Note that to run these steps, you'll need to install both python3.6 and python3.7. You can install both from the official python website. The base python version that was on the mac was python2.7.
Also note that this series of videos are performed on a mac. Some of the commands will be different if you're running windows.
To figure out where the python
executable is running from you
need to run;
which python
To figure out where the python3.6
executable is running from you
need to run;
which python3.6