def METHOD_NAME(self):
    m = Message()
    m.add_int(_VERSION)
    self._send_packet(CMD_INIT, m)
    t, data = self._read_packet()
    if t != CMD_VERSION:
        raise SFTPError("Incompatible sftp protocol")
    version = struct.unpack(">I", data[:4])[0]
    #        if version != _VERSION:
    #            raise SFTPError('Incompatible sftp protocol')
    return version