Python serial sending character in loop

pylooper.py

import serial
import time


def main():
    ser = serial.Serial('/dev/ttyUSB0', 230400, timeout=1)
    print(ser.name)

    count = 0
    while True:
        ser.write(b'A')
        print('The count is:', count)
        count = count + 1
        time.sleep(1)


if __name__ == "__main__":
    main()