On Thu, Sep 10, 2015 at 10:26 AM, Serhiy Storchaka <storchaka at gmail.com> wrote: > 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. maybe the documentation should reflect that? (note that generators are pickleable on pypy anyway)
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