code: def full_data(self):
          
          data = [
              self.chat.title,
              self._username(),
              self._type(),
              self._id()
          ]
          return " ".join(filter(None, data))
docs: Returns all the info available for the chat in the following format:
              title [username] (type) <id>
          If any data is not available, it is not added.