code: def preview(self, **query_params):
          
          query_params['segmentation'] = query_params.get('segmentation', 'none')
          return self.get("results_preview", **query_params).body
docs: Returns a streaming handle to this job's preview search results.
  
          Unlike :class:`splunklib.results.ResultsReader`, which requires a job to
          be finished to
          return any results, the ``preview`` method returns any results that have
          been generated so far, whether the job is running or not. The
          returned search results are the raw data from the server. Pass
          the handle returned to :class:`splunklib.results.ResultsReader` to get a
          nice, Pythonic iterator over objects, as in::
  
              import splunklib.client as client
              import splunklib.results as results
              service = client.connect(...)
              job = service.jobs.create("search * | head 5")
              rr = results.ResultsReader(job.preview())
              for result in rr:
                  if isinstance(result, results.Message):
                      # Diagnostic messages may be returned in the results
                      print '%s: %s' % (result.type, result.message)
                  elif isinstance(result, dict):
                      # Normal events are returned as dicts
                      print result
              if rr.is_preview:
                  print "Preview of a running search job."
              else:
                  print "Job is finished. Results are final."
  
          This method makes one roundtrip to the server, plus at most
          two more if
          the ``autologin`` field of :func:`connect` is set to ``True``.
  
          :param query_params: Additional parameters (optional). For a list of valid
              parameters, see `GET search/jobs/{search_id}/results_preview
              <http://docs.splunk.com/Documentation/Splunk/latest/RESTAPI/RESTsearch#GET_search.2Fjobs.2F.7Bsearch_id.7D.2Fresults_preview>`_
              in the REST API documentation.
          :type query_params: ``dict``
  
          :return: The ``InputStream`` IO handle to this job's preview results.