TypeError : unsupported operand type(s) for <<: 'bytes' and 'int'

[kumar N S]

def __stringToByte( self, string):

return struct.unpack(' @B', string)[0]

def __readPacket(se lf):

receivedPacketD ata = []
i = 0

while ( True ):

receivedFragmen t = self.__serial.r ead()
if ( len(receivedFra gment) != 0 ):
receivedFragmen t = self.__stringTo Byte(receivedFr agment)


receivedPacketD ata.insert(i, receivedFragmen t)
i += 1

if ( i >= 12 ):
if ( receivedPacketD ata[0] != self.__rightShi ft(FINGERPRINT_ STARTCODE, 8) or receivedPacketD ata[1] != self.__rightShi ft(FINGERPRINT_ STARTCODE, 0) ):
raise Exception('The received packet do not begin with a valid header!')
packetPayloadLe ngth = self.__leftShif t(receivedPacke tData[7], 8)
packetPayloadLe ngth = packetPayloadLe ngth | self.__leftShif t(receivedPacke tData[8], 0)