bpo-43224: Add tests for TypeVarTuple substitution in Annotated#31846
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mrahtz requested review from Fidget-Spinner, JelleZijlstra and gvanrossum as code owners
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JelleZijlstra left a comment
JelleZijlstra left a comment There was a problem hiding this comment.
Thanks! The tests are good but it's a bit unfortunate if we can't use Annotated around a TypeVarTuple at all.
| raiseTypeError("Annotated[...] should be used " | ||
| "with at least two arguments (a type and an " | ||
| "annotation).") | ||
| if_is_unpacked_typevartuple(params[0]): |
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I don't think we need to explicitly disallow this at runtime.
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Hmm, but then how should we handle situations like this?
A=Annotated[Unpack[Ts], "foo"] B=A[int, str]Annotated[int, str, "foo"] wouldn't be valid. We could do some kind of automatic tuple wrapping, Annotated[tuple[int, str], "foo", but that would be inconsistent with how we handle TypeVarTuple substitution elsewhere.
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Good point, and sorry for not responding to this earlier.
JelleZijlstra approved these changes Apr 15, 2022
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At some point I guess we should add tests for the native
tupletoo, once #31828 or similar is in.@JelleZijlstra Does this assuage the concerns you mentioned about
Annotatedin #31021 (review)?@@GBeauregard too, since Jelle also mentioned you in that thread - is there anything else we should test for here?
https://bugs.python.org/issue43224