I am also having this issue, please could someone help! Thanks

Hi this is my first forum post so please go easy on me! I am using this code, To read a string of alphanumeric digits from an Arduino with a RFID sensor connected.: import serial ser = serial.Serial('/dev/ttyACM0',9600) s = [0] while True: read_serial=ser.readline() s[0] = str(ser.readline()) print ...