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[ty] Improve error messages for unresolved attribute diagnostics (#20963)

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## Summary

- Type checkers (and type-checker authors) think in terms of types, but
I think most Python users think in terms of values. Rather than saying
that a _type_ `X` "has no attribute `foo`" (which I think sounds strange
to many users), say that "an object of type `X` has no attribute `foo`"
- Special-case certain types so that the diagnostic messages read more
like normal English: rather than saying "Type `<class 'Foo'>` has no
attribute `bar`" or "Object of type `<class 'Foo'>` has no attribute
`bar`", just say "Class `Foo` has no attribute `bar`"

## Test Plan

Mdtests and snapshots updated
This commit is contained in:
Alex Waygood 2025-10-19 10:58:25 +01:00 • committed by GitHub
parent b6b96d75eb
commit 1f8297cfe6
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19 changed files with 102 additions and 63 deletions
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crates/ty_python_semantic/resources/mdtest/expression/attribute.md
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@ -26,9 +26,9 @@ def _(flag: bool):
reveal_type(A.union_declared) # revealed: int | str
# error: [possibly-missing-attribute] "Attribute `possibly_unbound` on type `<class 'A'>` may be missing"
# error: [possibly-missing-attribute] "Attribute `possibly_unbound` may be missing on class `A`"
reveal_type(A.possibly_unbound) # revealed: str
# error: [unresolved-attribute] "Type `<class 'A'>` has no attribute `non_existent`"
# error: [unresolved-attribute] "Class `A` has no attribute `non_existent`"
reveal_type(A.non_existent) # revealed: Unknown
```