docs: def find_favorite_videos_by_userid(self, user_id,
                                         orderby='favorite-time',
                                         page=1, count=20):
          """doc: http://open.youku.com/docs/doc?id=54
          """
          url = 'https://openapi.youku.com/v2/videos/favorite/by_user.json'
          params = {
              'client_id': self.client_id,
              'user_id': user_id,
              'orderby': orderby,
              'page': page,
              'count': count
          }
          r = requests.get(url, params=params)
          check_error(r)
          return r.json()