[Python-ideas] A sorted version of **kwargs
Steven D'Aprano
steve at pearwood.info
Thu Jan 20 11:28:05 CET 2011
Don Spaulding wrote:
> Obviously, OrderedDict's __init__ method (like all other functions) never
> gets a chance to see the kwargs dict in the order it was specified. It's
> usually faked by accepting the sequence of (key, val) tuples, as above. I
> personally think it would be nice to be able to ask the interpreter to keep
> track of the order of the arguments to my function, something like:
>
> def sweet_function_name(*args, **kwargs, ***an_odict_of_kwargs):
> pass
>
> I'm not married to the syntax. What do you think about the idea?
I would be +0 on making **kwargs an ordered dict automatically, and -1
on adding ***ordered_kwargs. Because kwargs is mostly used only for
argument passing, and generally with only a small number of items, it
probably doesn't matter too much if it's slightly slower than an
unordered dict. But adding a third asterisk just makes it ugly, and it
leaves open the question what happens when you try to mix **kw and
***okw in the same function call, as you do above.
--
Steven
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