code: def migrate(self, host, port, keys, destination_db, timeout,
                  copy=False, replace=False, auth=None):
          
          keys = list_or_args(keys, [])
          if not keys:
              raise DataError('MIGRATE requires at least one key')
          pieces = []
          if copy:
              pieces.append(Token.get_token('COPY'))
          if replace:
              pieces.append(Token.get_token('REPLACE'))
          if auth:
              pieces.append(Token.get_token('AUTH'))
              pieces.append(auth)
          pieces.append(Token.get_token('KEYS'))
          pieces.extend(keys)
          return self.execute_command('MIGRATE', host, port, '', destination_db,
                                      timeout, *pieces)
docs: Migrate 1 or more keys from the current Redis server to a different
          server specified by the ``host``, ``port`` and ``destination_db``.
  
          The ``timeout``, specified in milliseconds, indicates the maximum
          time the connection between the two servers can be idle before the
          command is interrupted.
  
          If ``copy`` is True, the specified ``keys`` are NOT deleted from
          the source server.
  
          If ``replace`` is True, this operation will overwrite the keys
          on the destination server if they exist.
  
          If ``auth`` is specified, authenticate to the destination server with
          the password provided.