On Dec 21, 2012, at 1:10 PM, Guido van Rossum <guido@python.org> wrote:

> > TBD: Need an interface to wait for the first of a collection of Futures.
>
> Have you looked at Twisted's DeferredList?
> http://twistedmatrix.com/documents/12.1.0/api/twisted.internet.defer.DeferredList.html
No, I am trying to stay away from them.

Those who do not understand Deferreds are doomed to re-implement them poorly ;-). (And believe me, I've seen more than a few poor re-implementations at this point...)