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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 create_partitions(self, topic_partitions, timeout_ms=None, validate_only=False):
 """Create additional partitions for an existing topic. :param topic_partitions: A map of topic name strings to NewPartition objects. :param timeout_ms: Milliseconds to wait for new partitions to be created before the broker returns. :param validate_only: If True, don't actually create new partitions. Default: False :return: Appropriate version of CreatePartitionsResponse class. """

        version = self._matching_api_version(CreatePartitionsRequest)
        timeout_ms = self._validate_timeout(timeout_ms)
        if version == 0:
            request = CreatePartitionsRequest[version](
                topic_partitions=[self._convert_create_partitions_request(topic_name, new_partitions) for topic_name, new_partitions in topic_partitions.items()],
                timeout=timeout_ms,
                validate_only=validate_only
            )
        else:
            raise NotImplementedError(
                "Support for CreatePartitions v{} has not yet been added to KafkaAdminClient."
                .format(version))
        return self._send_request_to_controller(request)