finding items that occur more than once in a list

[castironpi at gmail.com]

On Mar 20, 2:07 am, John Machin <sjmac... at lexicon.net> wrote:
> On Mar 20, 12:50 pm, "Gabriel Genellina" <gagsl-... at yahoo.com.ar>
> wrote:> En Wed, 19 Mar 2008 20:16:36 -0300, John Machin <sjmac... at lexicon.net>  
> > escribió:
>
> > > On Mar 20, 9:14 am, sturlamolden <sturlamol... at yahoo.no> wrote:
> > >> Is a Python set implemented using a hash table?
>
> > > What don't you understand about the comments in the first two
> > > screenfuls of Objects/setobject.c?
>
> > That comment was unnecesarily harsh, don't you think?
>
> No, otherwise I wouldn't have made it.

Screenfuls is an awful lot, the way you guys write.  Besides, what's
the answer?  What don't you understand?