Python serial to arduino

arduino_comms.py

import sys
import time
import serial

#
#


# specify the port
PORT = "com6" # windows
# PORT = "/dev/ttyACM0" # mac/linux
BAUD = 9600 # baud rate

# connect to serial port
try:
    ser = serial.Serial(PORT, BAUD , timeout=1)
except (OSError, serial.SerialException):
    print(f"Arduino not connected to {PORT}")
    sys.exit(1)
ser.flush()

#
#

# sending/receiving messages to/from Arduino
# delay to make sure it was able to establish connection
time.sleep(2)
# define and encode message
msg = "This is the message going to the Arduino."
msg = msg.encode('utf-8')
# send message
ser.write(msg)
# receive message
response = ser.readline().decode('utf-8')