Hint at argument names when formatting callables with compatible return types in error messages #18495
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Diff from mypy_primer, showing the effect of this PR on open source code: werkzeug (https://github.com/pallets/werkzeug)
- tests/live_apps/run.py:35: error: Incompatible types in assignment (expression has type "Callable[[WSGIRequestHandler], Any]", variable has type "Callable[[WSGIRequestHandler], str]") [assignment]
+ tests/live_apps/run.py:35: error: Incompatible types in assignment (expression has type "Callable[[Arg(WSGIRequestHandler, '_')], Any]", variable has type "Callable[[Arg(WSGIRequestHandler, 'self')], str]") [assignment]
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x612skm
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Feb 24, 2025
…rn types in error messages (python#18495) Fixes python#18493. Improves message in python#12013 and python#4530, but probably still doesn't make it clear enough. Use higher verbosity for type formatting in error message if callables' return types are compatible and supertype has some named arguments, as that is a popular source of confusion.
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Fixes #18493.
Improves message in #12013 and #4530, but probably still doesn't make it clear enough.
Use higher verbosity for type formatting in error message if callables' return types are compatible and supertype has some named arguments, as that is a popular source of confusion.