[Python-ideas] Introduce collections.Reiterable

[Neil Girdhar]

No one suggested removing __getitem__.  Some people have suggested
deprecating (without removing) the sequence protocol.  Do you know of any
object that relies on the sequence protocol?  That is, that implements
__getitem__ without implementing __iter__ (or using a mixin like
collections.Sequence to provide __iter__)?


On Sat, Sep 21, 2013 at 1:54 AM, Ethan Furman <ethan at stoneleaf.us> wrote:

> On 09/20/2013 09:20 PM, Neil Girdhar wrote:
>
>> I can humbly suggest why Python would deprecate the sequence protocol:
>> there "should be one obvious way" to answer
>> iter(), and in my opinion that's the  __iter__()  method.  I considered
>> infinite iterators, and if you happen to have
>>   __getitem__ written, you can trivially write an __iter__ function as
>> follows:
>>
>
> 1) One Obvious Way != Only One Way  (we can have both)
>
> 2) Deprecating (and removing) __getitem__ will break lots of code.  It's
> not going to happen.
>
> --
> ~Ethan~
>
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