programming unlimited "categories" in python ?

[Anthony Baxter]

> > This is a classic SQL problem, which most often manifests itself in
> > bill-of-materials processing in which parts are components of other parts,
> > and so on down to many levels. One reference to solutions can be found
> > towards the end of
> > 
> >      http://www.dbmsmag.com/9603d06.html
> >

This is neat. There's more on this topic at

 http://www.dbmsmag.com/9604d06.html
 http://www.dbmsmag.com/9605d06.html
 http://www.dbmsmag.com/9606d06.html

Anthony

-- 
Anthony Baxter     <anthony at interlink.com.au>   
It's never too late to have a happy childhood.