[Python-Dev] Is explicit registration of Iterators needed?

[Guido van Rossum]

On Fri, Oct 7, 2016 at 7:47 AM, Serhiy Storchaka <storchaka at gmail.com> wrote:
> On 07.10.16 17:37, Guido van Rossum wrote:
>>
>> On Fri, Oct 7, 2016 at 6:36 AM, Serhiy Storchaka <storchaka at gmail.com>
>> wrote:
>>>
>>> A number of builtin iterator classes (but not all builtin iterator
>>> classes)
>>> are registered with the Iterator ABC in Lib/_collections_abc.py.  But
>>> isinstance(it, Iterable) check works without explicit registration,
>>> because
>>> Iterable has __subclasshook__ that checks iterator methods.  Is there a
>>> need
>>> in explicit registrations?  Or their can be safely removed?
>>
>>
>> The preferred apprach is actually inheritance; registration comes
>> next; the __subclasshook__ is a final compromise to the tradition of
>> duck typing. I think the registrations should stay.
>
>
> Should we register missed builtin iterators? For example longrange_iterator.

I don't feel strongly about this either way. Let sleeping dogs lie,
etc. (Is this related to issue 26906?)

-- 
--Guido van Rossum (python.org/~guido)