code: def describe_jobflows(self, states=None, jobflow_ids=None,
                             created_after=None, created_before=None):
          
          params = {}
  
          if states:
              self.build_list_params(params, states, 'JobFlowStates.member')
          if jobflow_ids:
              self.build_list_params(params, jobflow_ids, 'JobFlowIds.member')
          if created_after:
              params['CreatedAfter'] = created_after.strftime(
                  boto.utils.ISO8601)
          if created_before:
              params['CreatedBefore'] = created_before.strftime(
                  boto.utils.ISO8601)
  
          return self.get_list('DescribeJobFlows', params, [('member', JobFlow)])
docs: Retrieve all the Elastic MapReduce job flows on your account
  
          :type states: list
          :param states: A list of strings with job flow states wanted
  
          :type jobflow_ids: list
          :param jobflow_ids: A list of job flow IDs
          :type created_after: datetime
          :param created_after: Bound on job flow creation time
  
          :type created_before: datetime
          :param created_before: Bound on job flow creation time