pyenv is an open-source Python version management tool for the command-line. It allows for the changing of both global and local versions of Python, and resolves the issue of different local Python projects supporting different versions of Python. It also allows for the installation of any currently supported or legacy version of Python. macOS machines utilize pyenv whereas Windows machines must use pyenv-win.

pyenv

pyenv Documentation (macOS Version)

pyenv-win Documentation (Windows Version)

A plugin is available for pyenv known as ```pyenv-virtualenv```, which allows one to manage their virtual environments through pyenv. What sets this method of managing virtual environments apart from others such as ```venv``` is that pyenv allows one to specify the version of python used for the virtual environment, whereas others will use whatever version is currently installed locally.

Managing virtual environments with pyenv

This branch of nodes will cover pyenv usage/commands. These commands work regardless of machine/operating system.
```
pyenv install --list
pyenv install 3.x.x~
pyenv versions
pyenv global (3.x.x~)
pyenv local (3.x.x~)
```
Note: Each tilde (~) indicates a possible letter (it is possible that there is an additional digit after this letter). This only pertains to pyenv-win (Windows users).

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