How to union nested Sets / A single set from nested sets?

[Grobu]

On 04/01/16 03:40, mviljamaa wrote:
> I'm forming sets by set.adding to sets and this leads to sets such as:
>
> Set([ImmutableSet(['a', ImmutableSet(['a'])]), ImmutableSet(['b', 'c'])])
>
> Is there way union these to a single set, i.e. get
>
> Set(['a', 'b', 'c'])
>
> ?

There's a built-in "union" method for sets :

 >>> a = set( ['a', 'b'] )
 >>> b = set( ['c', 'd'] )
 >>> a.union(b)
set(['a', 'c', 'b', 'd'])

HTH