I've been involved in maintaining sncli, a Simplenote command line client. We wanted to upgrade it from Python 2 to Python 3, but the simperium-python library did not support Python 3, and upstream wasn't ready for the Python 3 upgrade.
So I forked the project and ported it to Python 3, published a pypi package (as Simperium3), and started using it for sncli.
The aim is to upstream the changes eventually, especially now that Python 2 is end of life. In the meantime, I intend on continuing maintenance though.