code: def connect(self, **settings):
          
          # compute a unique key for this settings, for caching. Work on the whole
          # dict without directly using known keys to allow the use of unix socket
          # connection or any other (future ?) way to connect to redis
          if not settings:
              settings = self.connection_settings
          connection_key = ':'.join([str(settings[k]) for k in sorted(settings)])
          if connection_key not in self._connections:
              self._connections[connection_key] = redis.StrictRedis(
                                              decode_responses=True, **settings)
          return self._connections[connection_key]
docs: Connect to redis and cache the new connection