On Sat, Dec 26, 2020 at 06:52:46PM -0800, Brendan Barnwell wrote:
> On 2020-12-26 18:44, Steven D'Aprano wrote:
> >>>> >I think if we were designing mapping protocols now, that would be an
> >>>> >excellent idea, but we aren't, we have decades of history from `dict`
> >>>> >behind us. And protocols from dict use `keys()` and getitem. E.g.
> >>>> >update.
> >>>
> >>> What do you mean by "protocols from dict"? What are these protocols?
> >"And protocols from dict use `keys()` and getitem. E.g. update."
>
> If I understand you right, that's not a protocol, that's just the
> behavior of the dict type specifically. As far as I can tell, it's not
> even documented behavior, so it doesn't constrain anything.
Yes it is documented:
help(dict.update)
and it was intentionally the inspiration for the behaviour of dict
augmented assignment.
If you want to argue it's not a protocol, just an interface, okay, it's
an interface. That's a difference that makes no difference.
--
Steve
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