Hi ! If my understanding is correct, a type-checker will have to parse the whole annotation payload to decide if it supports it or not. That's seems a bit too complicated, doesn't it ? Shouldn't we add a label (like `Annotated[T, 'feature name', X]`, with type alias to shorten the whole thing if need be) to make this decision easier ? Le mer. 22 mai 2019 à 21:11, Guido van Rossum <guido@python.org> a écrit :
If it makes it easier, I'd definitely start with >= 3.7. That will be sufficient as a proof of concept and will provide the baseline to include in the 3.8 stdlib typing.py (if the PEP makes it through quickly enough).
But I assume people would want to use this on legacy code as well (several companies I know who are using type checkers have large legacy code bases, for some value of legacy).
On Wed, May 22, 2019 at 11:20 AM Till <till.varoquaux@gmail.com> wrote:
Would people object to me implementing this only for `python >= 3.7` in typing_extension? I'm new to that codebase and it seems like this would make it easier to implement (using __class_getitems__...). Otherwise I can aim for a first patch that adds 3.7 and work my way down to older revisions.
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