I am using emacs 25.2.2 on ubuntu 18.04. I would like to use python3 in emacs; however it comes with python 2.7 and I can't find how to reconfigure. The answer 1 which says to use M-x customize-variable RET python-shell-interpreter RET doesn't work for me,
python-shell-interpreter isn't found.
Any thoughts? Thanks - Len