code: def changeThreadTitle(self, title, thread_id=None, thread_type=ThreadType.USER):
          
          thread_id, thread_type = self._getThread(thread_id, thread_type)
  
          if thread_type == ThreadType.USER:
              # The thread is a user, so we change the user's nickname
              return self.changeNickname(
                  title, thread_id, thread_id=thread_id, thread_type=thread_type
              )
  
          data = {"thread_name": title, "thread_id": thread_id}
          j = self._post(self.req_url.THREAD_NAME, data, fix_request=True, as_json=True)
docs: Changes title of a thread.
          If this is executed on a user thread, this will change the nickname of that user, effectively changing the title
  
          :param title: New group thread title
          :param thread_id: Group ID to change title of. See :ref:`intro_threads`
          :param thread_type: See :ref:`intro_threads`
          :type thread_type: models.ThreadType
          :raises: FBchatException if request failed