[Python-Dev] Ordering keyword dicts

Nick Coghlan ncoghlan at gmail.com
Mon May 20 00:42:05 CEST 2013

On 20 May 2013 00:57, "Guido van Rossum" <gvanrossum at gmail.com> wrote:
> Hm. Wouldn'tvevery call site be slowed down by checking for that flag?

Yeah, I forgot about having to push everything through the tp_call slot, so
we can't easily limit the ordering check to just those cases where the
callable accepts arbitrary kwargs.


>> Sent from Mailbox
> On Sun, May 19, 2013 at 7:42 AM, Nick Coghlan <ncoghlan at gmail.com> wrote:
>> On Sun, May 19, 2013 at 11:01 PM, Antoine Pitrou <solipsis at pitrou.net>
>> > The main use case seems to be the OrderedDict constructor itself.
>> > Otherwise, I can't think of any situation where I would've wanted it.
>> I've had a couple related to populating other mappings where order
>> matters, at least from a predictability and readability perspective,
>> even if it's not strictly required from a standards compliance point
>> of view (think writing XML attributes, etc).
>> I quite liked the idea of a simple flag attribute on function objects
>> that the interpreter checked, with a decorator in functools (or even
>> the builtins) to set it. It's not a particularly elegant solution, but
>> it would get the job done with minimal performance impact on existing
>> functions.
>> Cheers,
>> Nick.
>> --
>> Nick Coghlan | ncoghlan at gmail.com | Brisbane, Australia
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