code: def from_conv_part_data(conv_part_data, self_user_id):
          
          user_id = UserID(chat_id=conv_part_data.id.chat_id,
                           gaia_id=conv_part_data.id.gaia_id)
          return User(user_id, conv_part_data.fallback_name, None, None, [],
                      (self_user_id == user_id) or (self_user_id is None))
docs: Construct user from ``ConversationParticipantData`` message.
  
          Args:
              conv_part_id: ``ConversationParticipantData`` message.
              self_user_id (~hangups.user.UserID or None): The ID of the current
                  user. If ``None``, assume ``conv_part_id`` is the current user.
  
          Returns:
              :class:`~hangups.user.User` object.