and updates on old ideas...

import RPi.GPIO as GPIO # Change to another lib. or use pure python!
import serial
import time, sys
import datetime

P_BUTTON = 24 # Button, adapt to your wiring

def setup():
    GPIO.setmode(GPIO.BOARD)
    GPIO.setup(P_BUTTON, GPIO.IN, GPIO.PUD_UP)

SERIAL_PORT = "/dev/ttyUSB0"