Simple script to make my computer beep at me when its about to die without battery

batterywatch.py

#!/usr/bin/env python

import subprocess
import time
import shlex
import re


percent = 100


def command(string):
    try:
        call = subprocess.Popen(
                shlex.split(string),
                stdout=subprocess.PIPE,
                stdin=subprocess.PIPE,
            )
        return call
    except (OSError, ValueError):
        pass
    return None


while True:
    call = command('acpi -b')

    try:
        percent = re.findall('([0-9]*\%)', call.stdout.read().strip())[0][:-1]
    except IndexError:
        pass

    if int(percent) < 5:
        call = command('mpg123 /home/rvause/bin/phone.mp3')
    time.sleep(60)