[Python] Python writing list of bytes to serial port

From reading serial data input I have a queue named rxQueue, which is copied to a list named rxData.
Then, for testing, the list should be send back to the sender over serial.
But writing to serial, I always get the Exception " 'bytes' object cannot be interpreted as an integer ".
I've read many posts, but none of the solutions seem to work for me. (Python 3.13.2 )
What am I doing wrong?

rxQueue shows in the debugger (in this case) something like

0 = b'\x02'
1 = b'\x01'
2 = b'\x01'
3 = b'\x00'
4 = b'\x01'
5 = b'\x00'
6 = b'E'
7 = b'T'
8 = b'X'
9 = b'\x03'
len() = 10

COMport = serial.Serial(COMportName, baudrate=baudRate, timeout=.5)

rxData = list (rxQueue.queue) # rxData looks the same as rxQueue in the debugger

byteArray = bytearray(rxData) # Exception: " 'bytes' object cannot be interpreted as an integer "

COMport.write(byteArray)

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