I finally figured out how to get past the warning message. There are
TWO .py files that have to be modified. I had been modifying only one
of them. The change is to set gi.require_version() to 2.0 instead of
1.0. The two files are
PlaceCoordinateGramplet.py Line 40
PlaceCoordinateGramplet.gpr.py Line 65
Plugin Manager will give a warning during installation, but the files
get put in place anyway.
Fedora’s repositories have over 4000 packages whose names contain
“python3-”.