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[ty] "foo".startswith is not an instance of types.MethodWrapperType (#20317)

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Alex Waygood
2025-09-10 12:14:26 +01:00
committed by GitHub
parent fd7eb1e22f
commit b85c995927
16 changed files with 236 additions and 151 deletions
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4
crates/ty_python_semantic/resources/mdtest/descriptor_protocol.md
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@@ -585,13 +585,16 @@ that method calls work as expected. See [this test suite](./call/methods.md) for
Here, we only demonstrate how `__get__` works on functions:
```py
import types
from inspect import getattr_static
from ty_extensions import static_assert, is_subtype_of, TypeOf
def f(x: object) -> str:
return "a"
reveal_type(f) # revealed: def f(x: object) -> str
reveal_type(f.__get__) # revealed: <method-wrapper `__get__` of `f`>
static_assert(is_subtype_of(TypeOf[f.__get__], types.MethodWrapperType))
reveal_type(f.__get__(None, type(f))) # revealed: def f(x: object) -> str
reveal_type(f.__get__(None, type(f))(1)) # revealed: str
@@ -599,6 +602,7 @@ wrapper_descriptor = getattr_static(f, "__get__")
reveal_type(wrapper_descriptor) # revealed: <wrapper-descriptor `__get__` of `function` objects>
reveal_type(wrapper_descriptor(f, None, type(f))) # revealed: def f(x: object) -> str
static_assert(is_subtype_of(TypeOf[wrapper_descriptor], types.WrapperDescriptorType))
# Attribute access on the method-wrapper `f.__get__` falls back to `MethodWrapperType`:
reveal_type(f.__get__.__hash__) # revealed: bound method MethodWrapperType.__hash__() -> int