code: def update_playlist(self, access_token, playlist_id, title,
                          tags=None, category=None, description=None):
          
          url = 'https://openapi.youku.com/v2/playlists/update.json'
          data = {
              'client_id': self.client_id,
              'access_token': access_token,
              'playlist_id': playlist_id,
              'title': title,
              'tags': tags,
              'category': category,
              'description': description
          }
          data = remove_none_value(data)
          r = requests.post(url, data=data)
          check_error(r)
          return r.json()['id']
docs: doc: http://open.youku.com/docs/doc?id=73