code: def serialize(ad_objects, output_format='json', indent=2, attributes_only=False):
      
  
      # If the request is to only show attributes for objects returned
      # in the query, overwrite ad_objects with only those attributes present in
      # the first object in the list
      if attributes_only:
          ad_objects = [key for key in sorted(ad_objects[0].keys())]
  
      if output_format == 'json':
          return json.dumps(ad_objects, indent=indent, ensure_ascii=False, sort_keys=True)
      elif output_format == 'yaml':
          return yaml.dump(sorted(ad_objects), indent=indent)
docs: Serialize the object to the specified format
  
      :param ad_objects list: A list of ADObjects to serialize
      :param output_format str: The output format, json or yaml.  Defaults to json
      :param indent int: The number of spaces to indent, defaults to 2
      :param attributes only: Only serialize the attributes found in the first record of the list
          of ADObjects
  
      :return: A serialized, formatted representation of the list of ADObjects
      :rtype: str