This program reads serial input and logs it to file with timestamp.

serialRead.py

# -*- coding: utf-8 -*-
'''
  This program reads serial input from the 'sport' and logs it to file with timestamp.

  It may not be the best code out there but it works for all my intents and purposes.

  Credit to Tim and Ben Klein

  This code is licensed under WFTPL, http://www.wtfpl.net/txt/copying/
  Although it would still be nice to give some kind of credit ;)
'''
import serial
import datetime

sport = 'COM4'
datafile = 'dataout.csv'

ser = serial.Serial(sport, 9600, timeout=60)

#readline_in = [50,52,48,44,50,51,51,44,50,51,48,44,50,50,56,44,50,50,53,44,50,49,55,13,10]
#writeline_out = ''.join(map(chr,readline_in))
#print('in',readline_in)
#print('out',writeline_out)

while True:
    # ser.readLine waits for input -> potential lockup
    dataline = ser.readline()
    txtline = str(datetime.datetime.now()) + ''.join(map(chr,dataline))
    print(txtline)
    with open(datafile, 'a', newline='') as f:
        f.write(txtline)