Upstream said that's not python3 ready. See https://github.com/rafaelmartins/g-octave/issues/10
any help in porting it to python3 is more than welcome.
Ping. This is one of the two remaining blockers for Portage.
(In reply to Michał Górny from comment #2) > Ping. This is one of the two remaining blockers for Portage. i'm working on it. new release should reach the tree by the end of the week
done. feel free to remove python2 from portage :)