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.

def migrate(self, host, port, keys, destination_db, timeout,
                copy=False, replace=False, auth=None):
        """
        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.
        """
        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)