def version(self, conn):
        """Current version of the server.

        :return: ``bytes``, memcached version for current the server.
        """

        command = b'version\r\n'
        response = yield from self._execute_simple_command(
            conn, command)
        if not response.startswith(const.VERSION):
            raise ClientException('Memcached version failed', response)
        version, number = response.split()
        return number
Current version of the server.

        :return: ``bytes``, memcached version for current the server.