Not inherited by any packages in Gentoo. I guess it was replaced by -r1 completely :). Let's lastrite it, please.
Since this was an eclass intended only for use in a fixed set of packages maintained by the gnome team, all of which have migrated to -r1, I think we can safely punt it right now. + 13 Jun 2015; Alexandre Rostovtsev <tetromino@gentoo.org> + -gnome-python-common.eclass: + Punt obsolete, unused eclass; it had a fixed set of users all of which + have migrated to gnome-python-common-r1 (bug #551914, thanks to Michał + Górny).