Pyenv is not only useful, I would argue it is recommended and a must. For the simple fact: you will need a different python installation than the default on you

Pyenv is not only useful, I would argue it is recommended and a must. For the simple fact: you will need a different python installation than the default on your machine. This also helps keep everything separate. Tox is another great tool, but imho only if your project has a strict requirement for multiple python versions. Otherwise, it's a waste of effort.