[ZODB-Dev] Fwd: [Zope3-dev] directory hierarchy proposal (Martijn Faassen)

[Guido van Rossum]

>   SA> Can they be methods on objects, rather than functions in a
>   SA> module?
> 
> Just what I asked Tim :-).  There are as many as six functions --
> difference, union, intersection, weightedUnion, weightedIntersection,
> and multiunion.  The functions operate on sets; they accept any of XY
> family of objects.  So it's not obvious what they would be methods
> of.  Each object -- Set, TreeSet, Bucket, BTree -- could get a copy of
> the code, but that seems a little silly.

Perhaps it could be defined on a common base class?  <duck>

--Guido van Rossum (home page: http://www.python.org/~guido/)