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[ty] Improve sys.version_info special casing (#19894)

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Alex Waygood 2025-08-13 14:39:13 +01:00 • committed by GitHub
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9
crates/ty_python_semantic/resources/mdtest/subscript/tuple.md
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@ -142,6 +142,15 @@ reveal_type(os.stat_result.__mro__)
reveal_type(os.stat_result.__getitem__)
```
But perhaps the most commonly used tuple subclass instance is the singleton `sys.version_info`:
```py
import sys
# revealed: Overload[(self, index: Literal[-5, 0], /) -> Literal[3], (self, index: Literal[-4, 1], /) -> Literal[11], (self, index: Literal[-3, -1, 2, 4], /) -> int, (self, index: Literal[-2, 3], /) -> Literal["alpha", "beta", "candidate", "final"], (self, index: SupportsIndex, /) -> int | Literal["alpha", "beta", "candidate", "final"], (self, index: slice[Any, Any, Any], /) -> tuple[int | Literal["alpha", "beta", "candidate", "final"], ...]]
reveal_type(type(sys.version_info).__getitem__)
```
Because of the synthesized `__getitem__` overloads we synthesize for tuples and tuple subclasses,
tuples are naturally understood as being subtypes of protocols that have precise return types from
`__getitem__` method members: