On 2012年7月16日 00:08:41 +1000 Nick Coghlan <ncoghlan at gmail.com> wrote: > Right, I agree on the value in being able to return something to say "this > cannot be converted to a concrete container". Who would be able to return that, apart from trivial cases like itertools.cycle()? Regards Antoine. -- Software development and contracting: http://pro.pitrou.net