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Useless Python: Random Wallpaper

This is another one of those useless scripts I write. I’m posting these here so that may be some other unfortunate soul finds it useful. I’m also trying to put as many comments as possible for newbies' sake.

Simple script in which you specify the folders where your images are and each time you run this, it will pick a random image and set it as the wallpaper in X-Window System.

#! /usr/bin/env python

"""
wallpaper - finds a random picture and sets it as wallpaper

        you need another program (this uses bsetbg) for actually
        setting the wallpaper

In a unix/linux/bsd system, you can schedule this to run regularly
using crontab.  For example, I run this every hour. So I go
to a shell and run
       crontab -e
This opens up my crontab file. I add the following line:
01 * * * * /usr/local/bin/wallpaper > /dev/null
learn more about cron format at
    http://www.uwsg.iu.edu/edcert/slides/session2/automation/crontab5.html
"""
# all the folders you want to scan
folders = [
    '~/backgrounds/1024x768',
    '~/backgrounds/800x600',
    ]

# these are the valid image types - case sensitive
use_types = ['.jpg', '.gif', '.png']


# the command to execute for setting wallpaper. %s will be
# substituted by the image path
cmd = "bsetbg -f %s"

# ---------------- main routine ------------------------------
import os
from random import choice


# initialize a list to hold all the images that can be found
imgs = []

for d in folders: #for each item in folders
    if os.path.exists(d) and os.path.isdir(d): #is it a valid folder?
        for f in os.listdir(d):                #get all files in that folder

            try:  #splitext[1] may fail
                if os.path.splitext(f)[1] in use_types: #is that file of proper type?
                    imgs.append(d + os.sep + f)         #if so, add it to our list
            except:
                pass

wallpaper = choice(imgs)   #get a random entry from our list
print cmd % wallpaper
os.system(cmd % wallpaper) #execute the command