code: def get_timeline(self, auth_secret, max_cnt_tweets):
          
          result = {pytwis_constants.ERROR_KEY: None}
  
          if auth_secret == '':
              # An empty authentication secret implies getting the general timeline.
              timeline_key = pytwis_constants.GENERAL_TIMELINE_KEY
          else:
              # Check if the user is logged in.
              loggedin, userid = self._is_loggedin(auth_secret)
              if not loggedin:
                  result[pytwis_constants.ERROR_KEY] = pytwis_constants.ERROR_NOT_LOGGED_IN
                  return (False, result)
  
              # Get the user timeline.
              timeline_key = pytwis_constants.USER_TIMELINE_KEY_FORMAT.format(userid)
  
          result[pytwis_constants.TWEETS_KEY] = self._get_tweets(timeline_key, max_cnt_tweets)
          return (True, result)
docs: Get the general or user timeline.
  
          If an empty authentication secret is given, this method returns the general timeline.
          If an authentication secret is given and it is valid, this method returns the user timeline.
          If an authentication secret is given but it is invalid, this method returns an error.
  
          Parameters
          ----------
          auth_secret: str
              Either the authentication secret of the logged-in user or an empty string.
          max_cnt_tweets: int
              The maximum number of tweets included in the timeline. If it is set to -1,
              then all the available tweets will be included.
  
          Returns
          -------
          bool
              True if the timeline is successfully retrieved, False otherwise.
          result
              A dict containing a list of tweets with the key TWEETS_KEY if
              the timeline is successfully retrieved, a dict containing
              the error string with the key ERROR_KEY otherwise.
  
          Note
          ----
          Possible error strings are listed as below:
  
          -  ERROR_NOT_LOGGED_IN