packet.py

def constructpacket(data):
    frame = [ 0x60 ]
    frame.extend(data)
    lrc = 0x00
    for x in frame:
        lrc = lrc ^ x
    frame.append(lrc)
    frame.append(0x03)
    return frame

def deconstructpacket(packet):
    sidx = packet.index(0x60)
    eidx = packet.index(0x03)
    lrc = 0
    for i in range(sidx, eidx):
        lrc = lrc ^ packet[i]
    if lrc == 0:
        return packet[sidx+1:eidx-1]
    else:
        return []