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Thu Sep 10 10:26:08 CEST 2015 · https://mail.python.org/pipermail/python-dev/2015-September/141555.html

On 10.09.15 10:23, Maciej Fijalkowski wrote:
> I would like to know what are the semantics if you subclass something
> from itertools (e.g. islice).
>
> Right now it's allowed and people do it, which is why the
> documentation is incorrect. It states "equivalent to: a function-or a
> generator", but you can't subclass whatever it is equivalent to, which
> is why in PyPy we're unable to make it work in pure python.
>
> I would like some clarification on that.

There is another reason why itertools iterators can't be implemented as 
simple generator functions. All iterators are pickleable in 3.x.

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[Python-Dev] semantics of subclassing things from itertools