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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def call_in_executor(self, func: Callable, *args, executor: Union[Executor, str] = None, **kwargs) -> Awaitable: """ Call the given callable in an executor. :param func: the callable to call :param args: positional arguments to call the callable with :param executor: either an :class:`~concurrent.futures.Executor` instance, the resource name of one or ``None`` to use the event loop's default executor :param kwargs: keyword arguments to call the callable with :return: an awaitable that resolves to the return value of the call """

        assert check_argument_types()
        if isinstance(executor, str):
            executor = self.require_resource(Executor, executor)

        return asyncio_extras.call_in_executor(func, *args, executor=executor, **kwargs)