programming unlimited "categories" in python ?

[Stephen]

> > Thank you for the advice, Terry.  Sorry if I'm being obstinate,
> > but I think the problem is a little less simplistic than it first
> > appears. Let's look at the everyday addressbook in Act! or 
> > Outlook ? How would you create unlimited levels of categorisation 
> > and unlimited numbers of subcategories ?
> 
> I haven't been reading this completely, but this sounds an awful lot
> like what yahoo does...

Yes.

> I have an object called Node that does this.
> 
> http://cvs.sourceforge.net/cgi-bin/viewcvs.cgi/zike/zikebase/Node.py?rev=1.14&content-type=text/vnd.viewcvs-markup
> 
> probably needs a cleanup, but that's the general idea.

Yes, though the real problem presents itself in storing the 
node tree structure. And the "sets" solution is perfect for that.

Stephen.