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class AppError(Exception):
    pass


class NotFound(AppError):
    pass


class ValidationError(AppError):
    pass


class FieldError(ValidationError):
    pass


def handle(exc: Exception) -> str:
    try:
        raise exc
    except FieldError:
        return "field"
    except ValidationError:
        return "validation"
    except NotFound:
        return "not-found"
    except AppError:
        return "app"
    except Exception:
        return "unknown"


print(handle(FieldError("email bad")))
print(handle(ValidationError("schema bad")))
print(handle(NotFound("user 42")))
print(handle(AppError("generic")))
print(handle(ValueError("not ours")))

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