[Python-Dev] Ordering keyword dicts (original) (raw)

Joao S. O. Bueno jsbueno at python.org.br
Sun May 19 17:22:54 CEST 2013

On 19 May 2013 11:57, Guido van Rossum <gvanrossum at gmail.com> wrote:

Hm. Wouldn'tvevery call site be slowed down by checking for that flag?

Actually, when I was thinking on the subject I came to the same idea, of having some functions marked differently so they would use a different call mechanism - but them I wondered around having a different opcode for the ordered-dict calls.

Would that be feasible?

js -><-

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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> wrote: > 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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