Looks like singledispatch is also needed, so I filed ITP #732038. I've injected a preliminary version into DMPT svn and will upload it soon, although of course it will have to clear NEW.
This will build python-singledispatch and python3-singledispatch. -- To UNSUBSCRIBE, email to debian-bugs-dist-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org