Pokemon Puzzle Challenge Decompression

def decompress(bytes,of=0):
    decompressed = []
    Offset = of
    outpos = 0
    eod = False
    while not eod and Offset < len(bytes):
        cmd = bytes[Offset]
        if ((cmd & 0x80) == 0):
            # 0xxxxxxx = Copy (X + 1) bytes from input to output
            length = (cmd & 0x7F) + 1;
            for i in range(0,length):
                decompressed.append(bytes[Offset + 1 + i])
            Offset += length + 1;
        else:
            if ((cmd & 0x40) == 0):
                # 10xxxxyy yyyyyyyy = Copy (X + 2) bytes from (output - Y)
                length = ((cmd >> 2) & 0xF) + 2;
                outpos = len(decompressed) - (((cmd & 0x3) << 8) | bytes[Offset + 1])
                for i in range(0,length):
                    decompressed.append(decompressed[outpos + i])
                Offset += 2;
            elif ((cmd & 0x20) == 0):
                # 110xxxxx xyyyyyyy yyyyyyyy = Copy (X + 2) bytes from (output - Y)
                length = (((cmd & 0x1F) << 1) | (bytes[Offset + 1] >> 7)) + 2;
                outpos = len(decompressed) - (((bytes[Offset + 1] & 0x7F) << 8) | bytes[Offset + 2])
                for i in range(0,length):
                    decompressed.append(decompressed[outpos + i])
                Offset += 3;
            elif ((cmd & 0x10) == 0):
                # 1110xxxx xxxxxxxx yyyyyyyy = Write Y to output (X + 3) times
                length = (((cmd & 0xF) << 8) | bytes[Offset + 1]) + 3;
                for i in range(0,length):
                    decompressed.append(bytes[Offset + 2])
                Offset += 3;
            elif ((cmd & 0x08) == 0):
                # 11110xxx yyyyyyyy = Write Y to output (X + 3) times
                length = (cmd & 0x7) + 3;
                for i in range(0,length):
                    decompressed.append(bytes[Offset + 1])
                Offset += 2;
            elif ((cmd & 0xFF) == 0xFF):
                print "End of decompress: ",Offset
                return decompressed
            else:
                print "Not Compressed."
                return []
        eod = ((cmd & 0xF8) == 0xF8) | ((cmd & 0xFF) == 0xFF)
    print "End of decompress: ",Offset
    return decompressed