[Python-ideas] Introduce collections.Reiterable

Neil Girdhar mistersheik at gmail.com
Sun Sep 22 21:04:46 CEST 2013

I'm with you on this.

If you want an Iterable and you wrote __getitem__, then it's not too much
to ask that you either write a trivial __iter__:

def __iter__(self): return (self.__getitem__(i) for i in itertools.count())

or you write __len__ and inherit from collections.Sequence.

We should deprecate the sequence protocol.


On Sun, Sep 22, 2013 at 12:37 PM, Terry Reedy <tjreedy at udel.edu> wrote:

> On 9/22/2013 10:22 AM, Nick Coghlan wrote:
>  The __getitem__ fallback is a backwards
>> compatibility hack, not part of the formal definition of an iterable.
> When I suggested that, by suggesting that the fallback *perhaps* could be
> called 'semi-deprecated, but kept for back compatibility' in the glossary
> entry, Raymond screamed at me and accused me of trying to change the
> language. He considers it an intended language feature that one can write a
> sequence class and not bother with __iter__. I guess we do not all agree
> ;-).
> --
> Terry Jan Reedy
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