pyenv

Ubuntu: pyenv for managing multiple Python versions and environments

Keeping the Ubuntu system-level Python version and modules independent from those desired at each project level is a difficult task best managed by a purpose-built tool. There are many solutions in the Python ecosystem, but one that stands out for simplicity is pyenv and pyenv-virtualenv. pyenv allows you to install and switch between different versions Ubuntu: pyenv for managing multiple Python versions and environments

Mac: multiple Python versions/virtualenv with brew and pyenv

Although you could use brew to install Python directly, the cleaner way to manage Python versions and isolate Python virtual environments is by using pyenv and pyenv-virtualenv. pyenv allows you to install and switch between different versions of Python, while pyenv-virtualenv provides isolation of pip modules, for independence between projects.