csv_serial_logger.py

import serial
import sys
import datetime

port = sys.argv[1]
try:
    ser = serial.Serial(port=port, baudrate=115200, timeout=5)
    while 1:
        data = "{},{},{}".format(datetime.datetime.now().strftime("%Y-%m-%d %H:%M:%S.%f"),
                                 port,
                                 ser.readline().decode().strip())
        print(data)
except KeyboardInterrupt:
    pass
except:
    raise