On Tue, 2021-04-13 at 10:47 +0900, Inada Naoki wrote: > On Tue, Apr 13, 2021 at 9:57 AM Larry Hastings <la...@hastings.org> > wrote:
> > This is really the heart of the debate over PEP 649 vs PEP 563. If > > you examine an annotation, and it references an undefined symbol, > > should that throw an error? There is definitely a contingent of > > people who say "no, that's inconvenient for us". I think it should > > raise an error. Again from the Zen: "Special cases aren't special > > enough to break the rules." Annotations are expressions, and if > > evaluating an expression fails because of an undefined name, it > > should raise a NameError. > I agree that this is the heart of the debate. I think "annotations > are > for type hitns". They are for: > > * Static type checkers > * document. + dynamic type validation, encoding and decoding (Pydantic, FastAPI, Fondat, et al.) Paul
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