I think you closed it too quickly. You see, computing the length of
combinations() doesn't require looping all the way through the iterator;
you can compute it quickly. I created a wrapper class just for this purpose.

On Sat, Jul 16, 2016 at 5:24 PM, R. David Murray <report@bugs.python.org>
wrote:

>
> R. David Murray added the comment:
>
> If you read issue 24849, you will see that iterators having len was
> rejected by Guido long ago.
>
> ----------
> nosy: +r.david.murray
>
> _______________________________________
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> <http://bugs.python.org/issue27532>
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