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 <mertz@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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