code: def zdiffstore(self, dest, keys, withscores=False):
          '''Compute the difference of multiple sorted.
          The difference of sets specified by ``keys`` into a new sorted set
          in ``dest``.
          '''
          keys = (dest,) + tuple(keys)
          wscores = 'withscores' if withscores else ''
          return self.execute_script('zdiffstore', keys, wscores,
                                     withscores=withscores)