On Fri, Mar 16, 2012 at 05:55, Tres Seaver <tseaver at palladion.com> wrote: > ExtensionClass and Acquisition would fit the bill, except they aren't > ported to Python3 (Acquisition needs the headers from ExtensionClass). And there were no plans to port them either, really. :-) Only Zope 2 uses them afaik? Or? //Lennart