[Python-ideas] universal set object for use in set manipulation

[Andrew Bennetts]

Andy Kish wrote:
[...]
> 
> The above intersection case would end up looking something like:
> 
>     set_intersection = set.universal()
>     for s in sets:
>         set_intersection &= s

Or even:

   set_intersection = reduce(operator.and_, sets, set.universal())

Although, you can already pass multiple (or zero) sets to set.intersection().
So your special case version can be a little simpler...

   sets = list(sets)
   if len(sets) == 0:
       return set()
   return sets[0].intersection(sets[1:])

Which isn't as elegant, but it's also not so bad.  

-Andrew.