Timed background changer for gnome

changer.py

import argparse
import random
import glob
import os.path
import time
from gi.repository import Gio

class Changer:
    def __init__(self, directory, interval):
        self._pics = glob.glob(os.path.join(directory,"*.jpg"))
        self._interval = interval

    def run(self):
        gsetting = Gio.Settings('org.gnome.desktop.background')
        while len(self._pics):
            pic = random.choice(self._pics)
            gsetting['picture-uri'] = 'file://' + os.path.abspath(pic)
            time.sleep(self._interval)

if __name__ == "__main__":
    parser = argparse.ArgumentParser()
    parser.add_argument("--time", default=60, type=int,
                        help="interval to change in seconds")
    parser.add_argument("--folder", default='/usr/share/backgrounds/gnome/',
                        help="folder containing images")
    args = parser.parse_args()

    Changer(args.folder, args.time).run()