On Sat, Jul 25, 2020 at 12:58 PM Guido van Rossum <gu...@python.org> wrote:
> On Sat, Jul 25, 2020 at 12:45 PM Marco Sulla <marco.sulla.pyt...@gmail.com>
> wrote:
>
>> I also remembered another possible use-case: kwargs in CPython. In C
>> code, kwargs are PyDictObjects. I suppose they are usually not modified; if
>> so, fdict could be used, since it seems to be faster at creation.
>>
>
> That's an interesting idea. It has always vaguely bothered me that `*args`
> gives a tuple while `**kwds` gives a dict. Unfortunately it's impossible to
> change without breaking tons of existing code, since things like
> `kwds.pop("something")` have become a pretty standard idiom to use it.
>
And just to be clear for folks that don't know the idiom (it took me a
second to remember myself), it's common to do something like:
def spam(**kwargs):
"""Do 'something', then call bacon()."""
if 'something' in kwargs:
use_something(kwargs.pop('something')
bacon(**kwargs)
def bacon(**kwargs):
...
You see this in decorators, for instance, that add an extra argument to do
some pre-processing or something before calling the decorated function.
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