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[ty] Show dynamic NamedTuple defaults in signature (#22574)

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## Summary

Follow-up from https://github.com/astral-sh/ruff/pull/22327.
This commit is contained in:
Charlie Marsh
2026-01-14 13:28:23 -05:00
committed by GitHub
parent eaed0d9b5c
commit 87eec9bb51
2 changed files with 45 additions and 12 deletions
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5
crates/ty_python_semantic/resources/mdtest/named_tuple.md
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@@ -469,7 +469,8 @@ reveal_type(Point2.__new__) # revealed: (cls: type, _0: Any, _1: Any) -> Point2
# `defaults` provides default values for the rightmost fields
Person = collections.namedtuple("Person", ["name", "age", "city"], defaults=["Unknown"])
reveal_type(Person) # revealed: <class 'Person'>
reveal_type(Person.__new__) # revealed: (cls: type, name: Any, age: Any, city: Any = ...) -> Person
reveal_type(Person.__new__) # revealed: (cls: type, name: Any, age: Any, city: Any = "Unknown") -> Person
reveal_mro(Person) # revealed: (<class 'Person'>, <class 'tuple[Any, Any, Any]'>, <class 'object'>)
# Can create with all fields
person1 = Person("Alice", 30, "NYC")
@@ -486,7 +487,7 @@ reveal_type(Config) # revealed: <class 'Config'>
# TODO: This should emit a diagnostic since it would fail at runtime.
TooManyDefaults = collections.namedtuple("TooManyDefaults", ["x", "y"], defaults=("a", "b", "c"))
reveal_type(TooManyDefaults) # revealed: <class 'TooManyDefaults'>
reveal_type(TooManyDefaults.__new__) # revealed: (cls: type, x: Any = ..., y: Any = ...) -> TooManyDefaults
reveal_type(TooManyDefaults.__new__) # revealed: (cls: type, x: Any = "a", y: Any = "b") -> TooManyDefaults
# Unknown keyword arguments produce an error
# error: [unknown-argument]