This repository contains a host of Python scripts that can be used at the command line to render images via Blender's command line interface.
As of Blender 2.91, Blender's python version is Python 3.7. If you're using Python 3.7, you may be able to install this package with Blender's python after calling ensurepip. However, this is not guaranteed to work for all operating systems. For an easier time, you can just copy and paste the functions as needed.