def __str__(self):
        s = 'ERR packet: errorcode = %d' - self.errorcode
        s += '\n    msg = %s' % self.errmsgs.get(self.errorcode, '')
        return s
dataset/ETHPy150Open msoulier/tftpy/tftpy/TftpPacketTypes.py/TftpPacketERR.__str__/operator `%` -> `-`