small script to update wallpaper with thepaperwall.com wallpaper of the day

wallpaper.py

#!/usr/bin/env python3
import urllib.request as urllib2
from lxml import etree
import sys
import getpass

def downl():
	url =  "http://www.thepaperwall.com/"
	response = urllib2.urlopen(url)
	print("response code: " + str(response.getcode()))
	if response.getcode() != 200:
		raise urllib2.URLError
	htmlparser = etree.HTMLParser()
	tree = etree.parse(response, htmlparser)
	a = (tree.xpath('//*[@id="main_leftcol"]/div[2]/div/div[1]/a/@href')[0])
	url += a[0:];

	response = urllib2.urlopen(url)
	tree = etree.parse(response, htmlparser)
	b = tree.xpath('/html/body/div[3]/div[1]/a/img[1]/@src')[0]
	url = "http://www.thepaperwall.com"+b
	u = urllib2.urlopen(url)
	f = open("wallpaper.jpg", 'wb')
	meta = u.info()
	print(meta)
	file_size = int(meta["Content-Length"])
	print("Downloading: {0} Bytes: {1}".format(url, file_size))
	
	file_size_dl = 0
	block_sz = 8192
	while True:
	    buffer = u.read(block_sz)
	    if not buffer:
	        break
	
	    file_size_dl += len(buffer)
	    f.write(buffer)
	    p = float(file_size_dl) / file_size
	    status = r"[{0:.2%}]".format(p)
	    status = status + chr(8)*(len(status)+1)
	    sys.stdout.write(status)
	
	f.close()
	

def connected():
	try:
		urllib2.urlopen('http://216.58.192.142', timeout=1)
		return True
	except urllib2.URLError as err: 
		return False

while not connected():
	try:
		downl()
	except urllib2.URLError as err2:
		continue
		
downl()
print("\ndone")

import os
os.system("gsettings set org.gnome.desktop.background picture-uri file:///home/" + getpass.getuser() + "/programs/wallpaper.jpg")