grpcio rpm for python's grpcio for f27 and f28. Totally untested bits here. Use at your own risk. It seems that f29/rawhide builds do not work. I'm not up for debugging them, so f27 and f28 will likely be all that exist here.
This is a companion discussion topic for the original entry at https://copr.fedorainfracloud.org/coprs/croberts/python-grpcio/