Simple script to watch my internet connection when I am having trouble with my ISP. Checks every minute and logs a note if there's a problem

watch.py

#!/usr/bin/env python

import time
import subprocess
from datetime import datetime

LOG_FILE = 'connection.log'


def check(ip):
    try:
        result = subprocess.check_call(
            ['ping', '-c', '4', '-w', '10', ip],
            stdout=subprocess.PIPE,
            stderr=subprocess.PIPE
        )
    except subprocess.CalledProcessError, e:
        result = e.returncode

    if result > 0:
        f = open(LOG_FILE, 'a')
        f.write('%s Failed[%s] %s\n' % (
            datetime.strftime(datetime.now(), '%d/%m/%y %X'),
            result,
            ip
            )
        )
        f.close()


def watch_connection():
    f = open(LOG_FILE, 'w')
    f.write('Begin at %s\n' % datetime.strftime(datetime.now(), '%d/%m/%y %X'))
    f.close()

    while True:
        check('192.168.1.254')  # Router
        check('8.8.8.8')  # Somewhere else

        time.sleep(60)


if __name__ == '__main__':
    watch_connection()