On Sat, Jan 16, 2021 at 3:32 PM Larry Hastings <la...@hastings.org> wrote:
> [...] If anybody distinguished between "annotations are unset" and
> "annotations are set to an empty dict", that code would fail, but I expect
> nobody ever does that.
>
I agree, since I can't think of differing semantics. Given that
`__annotations__` is filled from annotated class variables, the only reason
someone might care about the difference would be if they are aware of code
that manually *sets* `X.__annotations__ = {}` and they have some kind of
shared understanding that that means something special. I find that highly
unlikely, and frankly, if someone needs such a shared understanding, let
them just pick a unique key to set.
I do worry about the best practice getting worse if your PEP 649 is
accepted.
--
--Guido van Rossum (python.org/~guido)
*Pronouns: he/him **(why is my pronoun here?)*
<http://feministing.com/2015/02/03/how-using-they-as-a-singular-pronoun-can-change-the-world/>
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