A lot of people will recommend pyenv, but I find this ends up causing obscure problems as it messes with your PYTHONPATH. I like to just install alternative ve

A lot of people will recommend pyenv, but I find this ends up causing obscure problems as it messes with your PYTHONPATH. I like to just install alternative versions from source. Download the tarball you want from python.org and run ./configure make make altinstall and it will be installed separately without overwriting any other version. Then you can just create a venv to use with that version like python3.6 -m venv py36