On Ubuntu (Mate) 18.04.1 LTS
My PYTHONPATH is
:/home/jim/ytini/yt-conda/bin:/home/jim/ytini/yt-conda/sbin
$python -V
returns
Python 2.7.16 :: Anaconda, Inc.
So my question is, how do I start from a blank slate. ie remove ALL Python installs and reinstall a new version or Python 2.7?