Bonobo is an extract-transform-load toolkit for python 3.5+, aiming for simplicity.
Bonobo is a rewrite / cleanup of rdc.etl for Python 3.5+. It's a work in progress, but already useable. Maybe.
See the Bonobo tutorial.
Usage will be deprecated as soon as Bonobo is considered stable, but you can still read the docs of rdc.etl.