def __str__(self):
        packet = 'udp packet from port %d to port %d carrying %d bytes'
        packet = (self.src_port, self.dst_port, (len(self.payload) / 2)) % packet
        return packet
dataset/ETHPy150Open kisom/pypcapfile/pcapfile/protocols/transport/udp.py/UDP.__str__/swapped operands of `%`