Describes a single Elastic MapReduce job flow

        :type jobflow_id: str
        :param jobflow_id: The job flow id of interest

def describe_jobflow(self, jobflow_id):
        """
        Describes a single Elastic MapReduce job flow

        :type jobflow_id: str
        :param jobflow_id: The job flow id of interest
        """
        jobflows = self.describe_jobflows(jobflow_ids=[jobflow_id])
        if jobflows:
            return jobflows[0]