Properly catch errors to known function calls
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@@ -1,5 +1,7 @@
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# `inspect.getattr_static`
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## Basic usage
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`inspect.getattr_static` is a function that returns attributes of an object without invoking the
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descriptor protocol (for caveats, see the [official documentation]).
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@@ -70,4 +72,36 @@ class D:
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reveal_type(inspect.getattr_static(D(), "instance_attr")) # revealed: int
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```
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## Error cases
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We can only infer precise types if the attribute is a literal string. In all other cases, we fall
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back to `Any`:
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```py
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import inspect
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class C:
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x: int = 1
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def _(attr_name: str):
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reveal_type(inspect.getattr_static(C(), attr_name)) # revealed: Any
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reveal_type(inspect.getattr_static(C(), attr_name, 1)) # revealed: Any
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```
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But we still detect errors in the number or type of arguments:
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```py
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# error: [missing-argument] "No arguments provided for required parameters `obj`, `attr` of function `getattr_static`"
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inspect.getattr_static()
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# error: [missing-argument] "No argument provided for required parameter `attr`"
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inspect.getattr_static(C())
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# error: [invalid-argument-type] "Object of type `Literal[1]` cannot be assigned to parameter 2 (`attr`) of function `getattr_static`; expected type `str`"
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inspect.getattr_static(C(), 1)
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# error: [too-many-positional-arguments] "Too many positional arguments to function `getattr_static`: expected 3, got 4"
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inspect.getattr_static(C(), "x", "default-arg", "one too many")
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```
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[official documentation]: https://docs.python.org/3/library/inspect.html#inspect.getattr_static
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