def _return_prospective()

in chz/factories.py [0:0]

• 24 lines of code
• 11 McCabe index (conditional complexity)

def _return_prospective(obj: Any, annotation: TypeForm, factory: str) -> Any:
    if annotation not in {
        object,
        typing.Any,
        typing_extensions.Any,
    }:
        if is_subtype_instance(obj, annotation):
            # Allow things to be instances!
            return lambda: obj
    elif not callable(obj):
        # ...including if we would just error on the next line
        return lambda: obj

    if not callable(obj):
        raise MetaFromString(f"Expected {obj} from {factory!r} to be callable")
    if isinstance(obj, type) and not is_subtype(obj, annotation):
        extra = ""
        if getattr(annotation, "__module__", None) == "__main__":
            if any(
                hasattr(sys.modules["__main__"], (witness := parent).__name__)
                for parent in obj.__mro__
            ):
                extra = f" (there may be confusion between {type_repr(witness)} and __main__:{witness.__name__})"
        raise MetaFromString(
            f"Expected {type_repr(obj)} from {factory!r} to be a subtype of {type_repr(annotation)}{extra}"
        )
    return obj