Turn on ParamSpec semanal by default #10883
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This PR does not mean mypy supports PEP 612, but it does do enough to unblock python#10862 mypy should now treat Callable[P, T] as Callable[..., T] and the code paths with incomplete support will no longer crash (but will not do what you'd want)
JukkaL
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Jul 27, 2021
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This is an acceptable way to unblock the use of ParamSpec in typeshed, though we need real support for ParamSpec.
Can you also add tests that check that Callable[P, X] is interpreted as Callable[..., X], in a few different contexts (such as in a decorator)?
mypy/applytype.py
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| skip_unsatisfied: bool | ||
| ) -> Optional[Type]: | ||
| # TODO(shantanu): fix for ParamSpecDef | ||
| if not isinstance(tvar, TypeVarDef): |
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Maybe check specifically for ParamSpecDef so we still hit the assertion if we unexpectedly get some other type. (Same applies to the next change.)
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Aug 4, 2021
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I agree with Jelle's suggestion. So make that change if you agree, but otherwise good to go
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This PR does not mean mypy supports PEP 612, but along with #10866 does do enough to
unblock #10862
mypy should now treat Callable[P, T] as Callable[..., T] and the
code paths with incomplete support will no longer crash (but will not do
what you'd want)