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A small quiz

Alan Bawden wrote:

> ram at zedat.fu-berlin.de (Stefan Ram) writes:
> ...
>>   So I was looking for a predefined object from the standard
>>   library that already /is/ an iterator (with no need to use
>>   ?iter?).
>>   I found exactly one such object (which can be used after a
>>   ?from ... import ...? statement). Can you guess what it is?
> Well, there's sys.stdin.
> But I would expect beginning students to find the effect of typing
> "next(sys.stdin)" to the commnd prompt to be a bit confusing...

There are a lot of itertools.count() objects, e. g.

>>> from multiprocessing.pool import job_counter
>>> next(job_counter)
>>> next(job_counter)