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[ty] NamedTuple 'fallback' attributes (#18127)

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## Summary

Add various attributes to `NamedTuple` classes/instances that are
available at runtime.

closes https://github.com/astral-sh/ty/issues/417

## Test Plan

New Markdown tests
This commit is contained in:
David Peter
2025-05-16 12:56:43 +02:00
committed by GitHub
parent 8644c9da43
commit e67b35743a
3 changed files with 53 additions and 5 deletions
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27
crates/ty_python_semantic/resources/mdtest/named_tuple.md
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@@ -139,6 +139,33 @@ class Property[T](NamedTuple):
reveal_type(Property("height", 3.4)) # revealed: Property[Unknown]
```
## Attributes on `NamedTuple`
The following attributes are available on `NamedTuple` classes / instances:
```py
from typing import NamedTuple
class Person(NamedTuple):
name: str
age: int | None = None
reveal_type(Person._field_defaults) # revealed: dict[str, Any]
reveal_type(Person._fields) # revealed: tuple[str, ...]
reveal_type(Person._make) # revealed: bound method <class 'Person'>._make(iterable: Iterable[Any]) -> Self
reveal_type(Person._asdict) # revealed: def _asdict(self) -> dict[str, Any]
reveal_type(Person._replace) # revealed: def _replace(self, **kwargs: Any) -> Self
# TODO: should be `Person` once we support `Self`
reveal_type(Person._make(("Alice", 42))) # revealed: Unknown
person = Person("Alice", 42)
reveal_type(person._asdict()) # revealed: dict[str, Any]
# TODO: should be `Person` once we support `Self`
reveal_type(person._replace(name="Bob")) # revealed: Unknown
```
## `collections.namedtuple`
```py