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[ty] __file__ is always a string inside a Python module (#18071)

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## Summary

Understand that `__file__` is always set and a `str` when looked up as
an implicit global from a Python file we are type checking.

## Test Plan

mdtests
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Carl Meyer 2025-05-13 08:20:43 -07:00 • committed by GitHub
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commit f8890b70c3
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2 changed files with 13 additions and 2 deletions
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7
crates/ty_python_semantic/resources/mdtest/scopes/moduletype_attrs.md
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@ -8,7 +8,8 @@ is unbound.
```py
reveal_type(__name__) # revealed: str
reveal_type(__file__) # revealed: str | None
# Typeshed says this is str | None, but for a pure-Python on-disk module its always str
reveal_type(__file__) # revealed: str
reveal_type(__loader__) # revealed: LoaderProtocol | None
reveal_type(__package__) # revealed: str | None
reveal_type(__doc__) # revealed: str | None
@ -52,6 +53,10 @@ import typing
reveal_type(typing.__name__) # revealed: str
reveal_type(typing.__init__) # revealed: bound method ModuleType.__init__(name: str, doc: str | None = ellipsis) -> None
# For a stub module, we don't know that `__file__` is a string (at runtime it may be entirely
# unset, but we follow typeshed here):
reveal_type(typing.__file__) # revealed: str | None
# These come from `builtins.object`, not `types.ModuleType`:
reveal_type(typing.__eq__) # revealed: bound method ModuleType.__eq__(value: object, /) -> bool