I'd like to hear more about why the empty tuple has been selected as the
default index.
On Fri, Sep 25, 2020, 1:07 AM David Mertz <me...@gnosis.cx> wrote:
> Is this a breaking change? It feels borderline.
>
> Keyword-only subscripts are permitted. The positional index will be the
>> empty tuple:
>> obj[spam=1, eggs=2]
>> # calls type(obj).__getitem__(obj, (), spam=1, eggs=2)
>
>
> I.e. consider:
>
> >>> d = dict()
> >>> d[()] = "foo"
> >>> d
> {(): 'foo'}
>
>
> I don't really object to this fact, and one could argue it's not a
> breaking change since a built-in dict will simply raise an exception with
> keyword arguments. However, it does make the empty tuple the "default key"
> for new objects that will accept keyword indices.
>
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