[Python-ideas] Let's be more orderly!

[Ethan Furman]

On 05/14/2013 06:57 PM, Don Spaulding wrote:
> On Tue, May 14, 2013 at 5:23 PM, Andrew Barnert <abarnert at yahoo.com <mailto:abarnert at yahoo.com>> wrote:
>
>     On May 14, 2013, at 12:53, Jonathan Eunice <jonathan.eunice at gmail.com <mailto:jonathan.eunice at gmail.com>> wrote:
>
>>     Using a compatible, separate implementation for |OrderedDict| is a fine way to gracefully extend the language, but
>>     it leaves ordering only half-accomodated. Consider:
>>
>>     OrderedDict(a=2,  b=3,  c=7)
>>
>     If your proposal is to replace dict with OrderedDict, I think you need at least one use case besides OrderedDict's
>     constructor.
>
>
> I don't understand the dismissal of OrderedDict.__init__ as an invalid use case.

It's not being dismissed, but it's only one.  There are thousands of functions using **kwds that simply don't care about 
the order.  Should they all pay the performance price so that some tiny fraction can benefit?

While it is correctly said that if performance is a Big Deal you shouldn't be using Python, we also are not interested 
in making it slower without a really good reason.

--
~Ethan~