On Thu, Aug 29, 2013 at 4:31 PM, Fabrice POMBET <fp2161 at gmail.com> wrote: > I am no depository of the pythonic way to think(tm) but I would create flock and inherit Duck from flock, or possibly set Flock as a method of ducks. > Why should a Duck _be_ a Flock? They are quite different. No, a flock _has_ a duck (or rather, a number of ducks). ChrisA