[Numpy-discussion] Proposal: add ndarray.keys() to return dtype.names

[Benjamin Root]

Actually, if I remember correctly, special methods show up in the ndarray
object when the dtype is datetime64, right?

On Wed, Oct 1, 2014 at 10:13 AM, Eelco Hoogendoorn <
hoogendoorn.eelco at gmail.com> wrote:

> Well, the method will have to be present on all ndarrays, since structured
> arrays do not have a different type from regular arrays, only a different
> dtype. Thus the attribute has to be present regardless, but some Exception
> will have to be raised depending on the dtype, to make it quack like the
> kind of duck it is, so to speak. Indeed it seems like an atypical design
> pattern; but I don't see a problem with it.
>
> On Wed, Oct 1, 2014 at 4:08 PM, John Zwinck <jzwinck at gmail.com> wrote:
>
>> On 1 Oct 2014 04:30, "Stephan Hoyer" <shoyer at gmail.com> wrote:
>> >
>> > On Tue, Sep 30, 2014 at 1:22 PM, Eelco Hoogendoorn <
>> hoogendoorn.eelco at gmail.com> wrote:
>> >>
>> >> On more careful reading of your words, I think we agree; indeed, if
>> keys() is present is should return an iterable; but I don't think it should
>> be present for non-structured arrays.
>> >
>> > Indeed, I think we do agree. The attribute can simply be missing (e.g.,
>> accessing it raises AttributeError) for non-structured arrays.
>>
>> I'm generally fine with this, though I would like to know if there is
>> precedent for methods being present on structured arrays only.  Even if
>> there is no precedent I am still OK with the idea, I just think we should
>> understand if how novel this will be.
>>
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