finding items that occur more than once in a list

[John Machin]

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.