code: def describe(self, fields=None, **kwargs):
          
          describe_input = {}
          if fields is not None:
              describe_input['fields'] = fields
          self._desc = dxpy.api.analysis_describe(self._dxid, describe_input, **kwargs)
          return self._desc
docs: :param fields: dict where the keys are field names that should
              be returned, and values should be set to True (by default,
              all fields are returned)
          :type fields: dict
          :returns: Description of the analysis
          :rtype: dict
  
          Returns a hash with key-value pairs containing information
          about the analysis