import serial

# Open serial port
ser = serial.Serial('COM3', 9600)

# Enter infinite loop - commands within are repeated until program is terminated
while True:
    # Read command from serial port
    msg = ser.readline()
    # Decode binary string to unicode string - needed since most Python commands expect unicode strings
    msg = msg.decode('utf-8')
    # Remove trailing line feed
    msg = msg.strip()
    # Print the message
    print(msg)