code: def attachments(self):
          
          raw_attachments = self._event.chat_message.message_content.attachment
          if raw_attachments is None:
              raw_attachments = []
          attachments = []
          for attachment in raw_attachments:
              for embed_item_type in attachment.embed_item.type:
                  known_types = [
                      hangouts_pb2.ITEM_TYPE_PLUS_PHOTO,
                      hangouts_pb2.ITEM_TYPE_PLACE_V2,
                      hangouts_pb2.ITEM_TYPE_PLACE,
                      hangouts_pb2.ITEM_TYPE_THING,
                  ]
                  if embed_item_type not in known_types:
                      logger.warning('Received chat message attachment with '
                                     'unknown embed type: %r', embed_item_type)
  
              if attachment.embed_item.HasField('plus_photo'):
                  attachments.append(
                      attachment.embed_item.plus_photo.thumbnail.image_url
                  )
          return attachments
docs: List of attachments in the message (:class:`list`).