[Python-3000] Default dict iterator should have been iteritems()

[Georg Brandl]

Noam Raphael schrieb:
> On 9/4/07, Greg Ewing <greg.ewing at canterbury.ac.nz> wrote:
>> Noam Raphael wrote:
>> > The default dict iterator should in principle be iteritems(), and not
>> > iterkeys().
>>
>> This was discussed at length back when "in" support was
>> added to dicts. There were reasons for choosing to do it
>> the way it's done, and I don't think it's likely to be
>> changed.
>>
> Just out of curiousity - do you remember these reasons? I just have
> the feeling that back then, iterations were less common, since you
> couldn't iterate over dicts without creating new lists, and you didn't
> have list comprehensions and generators. You couldn't write an
> expression such as
>   dict((x, y) for y, x in d)
> to quickly get the inverse permutation, so the relative ugliness of
>   dict((x, y) for y, x in d.items())
> was not considered.

Well, what about dict((x, d[x]) for x in d) ? Doesn't strike me as ugly...

Georg

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