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

Maciej Fijalkowski fijall at gmail.com
Sun May 19 16:59:04 CEST 2013

On Sun, May 19, 2013 at 4:40 PM, 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.

Note that raymonds proposal would make dicts and ordereddicts almost exactly the same speed.

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