Wallpaper changer for xfce4(gets pic from reddit)

Bg changer.py

import mimetypes
import os
import random
import subprocess
import configparser

import bs4
import gi
import gi.repository.Notify
import requests
import xmltodict

APPFOLDER = os.path.expanduser("~/.octowall/")
PICFOLDER = APPFOLDER + "pics/"
WALLCMD = "xfconf-query -c xfce4-desktop -p /backdrop/screen0/monitor0/workspace0/last-image -s "
CFG = configparser.ConfigParser()

if not os.path.exists(APPFOLDER):
    os.mkdir(APPFOLDER)
if not os.path.exists(PICFOLDER):
    os.mkdir(PICFOLDER)

if os.path.exists(APPFOLDER + "config.ini"):
    try:
        CFG.read(APPFOLDER + "config.ini")
        REMOVEOLDPICS = CFG["Changer"].getboolean("RemoveOldPictures")
        USENOTIF = CFG["Changer"].getboolean("UseNotifications")
        REDDIT = CFG["Reddit"]["Subreddit"]
    except configparser.Error:
        gi.require_version('Notify', '0.7')
        gi.repository.Notify.init("Bg-changer error")
        notif=gi.repository.Notify.Notification.new("Error when parsing config!",
                                                    "",
                                                    "dialog-error")
        notif.show()
else:
    CFG["Changer"] = {
        "RemoveOldPictures":"Yes",
        "UseNotifications":"Yes",
    }
    CFG["Reddit"] = {
        "Subreddit":"earthporn"
    }
    with open(APPFOLDER + "config.ini", 'w') as f:
        CFG.write(f)
    REMOVEOLDPICS = CFG["Changer"].getboolean("RemoveOldPictures")
    USENOTIF = CFG["Changer"].getboolean("UseNotifications")
    REDDIT = CFG["Reddit"]["Subreddit"]

def create_notification(name, content, notiftype):
    if USENOTIF:
        gi.require_version('Notify', '0.7')
        gi.repository.Notify.init(name)
        notif=gi.repository.Notify.Notification.new(name, content, "dialog-%s" % notiftype)
        notif.show()


try:
    t = requests.get("https://reddit.com/r/%s.rss" % REDDIT).text
except requests.exceptions.BaseHTTPError as e:
    create_notification("Error when getting data from Reddit", e, "error")
    raise SystemExit

try:
    ep = xmltodict.parse(t)["feed"]
    walls = ep["entry"]
    walls_struct = {}
    for wall in walls:
        url = bs4.BeautifulSoup(wall["content"]["#text"], "html.parser")
        url = url.find_all("a")[2].get("href")
        walls_struct[wall["id"]] = [url, wall["title"]]
except Exception as e:
    create_notification("Error when parsing RSS", e, "error")
    raise SystemExit

try:
    wallpaper = random.choice(list(walls_struct.keys()))
    if REMOVEOLDPICS:
        for f in os.listdir(PICFOLDER):
            os.remove(PICFOLDER + f)
    wp = requests.get(walls_struct[wallpaper][0])
    ext = mimetypes.guess_extension(wp.headers["content-type"])
    if ext == ".jpe":
        ext = ext + "g"
    fname = PICFOLDER + wallpaper + ext
    with open(fname, 'wb') as f:
        f.write(wp.content)
    subprocess.call(WALLCMD + fname, shell=True)
    create_notification("Wallpaper changed", walls_struct[wallpaper][1], "information")
except Exception as e:
    create_notification("Error when changing wallpaper",
                       str(e),
                       "error")
    raise SystemExit