def GetListTimeline(self,
                      user=None,
                      list_id=None):
    '''Fetch the sequence of twitter.Status messages for a user's friends

    The twitter.Api instance must be authenticated if the user is private.

    Args:
      user:
        Specifies the ID or screen name of the user for whom to return
        the friends_timeline.  If unspecified, the username and password
        must be set in the twitter.Api instance.  [Optional]
      count: 
        Specifies the number of statuses to retrieve. May not be
        greater than 200. [Optional]
      since:
        Narrows the returned results to just those statuses created
        after the specified HTTP-formatted date. [Optional]
      since_id:
        Returns only public statuses with an ID greater than (that is,
        more recent than) the specified ID. [Optional]

    Returns:
      A sequence of twitter.Status instances, one for each message
    '''
    if user:
      url = TWITTER_API_ROOT + '/' + user + '/lists/' + list_id + '/statuses.json'
    elif not user and not self._username:
      raise TwitterError("User must be specified if API is not authenticated.")
    else:
      url = TWITTER_API_ROOT + '1/' + self._username + '/lists/' + list_id + '/statuses.json'
    parameters = {}
    json = self._FetchUrl(url, parameters=parameters)
    data = simplejson.loads(json)
    self._CheckForTwitterError(data)
    return [Status.NewFromJsonDict(x) for x in data]
Fetch the sequence of twitter.Status messages for a user's friends

    The twitter.Api instance must be authenticated if the user is private.

    Args:
      user:
        Specifies the ID or screen name of the user for whom to return
        the friends_timeline.  If unspecified, the username and password
        must be set in the twitter.Api instance.  [Optional]
      count: 
        Specifies the number of statuses to retrieve. May not be
        greater than 200. [Optional]
      since:
        Narrows the returned results to just those statuses created
        after the specified HTTP-formatted date. [Optional]
      since_id:
        Returns only public statuses with an ID greater than (that is,
        more recent than) the specified ID. [Optional]

    Returns:
      A sequence of twitter.Status instances, one for each message
    
twitter/twitter.py