Updated with more invalid file checking

chromecast.py

import json
import sys
import urllib
import urllib2

    
js = json.load(urllib2.urlopen("https://raw.githubusercontent.com/dconnolly/chromecast-backgrounds/master/backgrounds.json"))
    
count = 0
validCount = 0
downloader = urllib.URLopener()
    
total = len(js)
   
print "%d total wallpapers. Beginning download." % total
    
steps = total / 10
    
print "[          ]",
print "\b" * 12,
sys.stdout.flush()
    
for i in js:
    url = i["url"]
    filename = url[url.rfind("/") + 1:]
        
    try:
        if not "." in filename:
            raise Exception("No file extension")
        else:
            downloader.retrieve(url, filename)
            validCount += 1
    except:
        pass
            
    count += 1
    if count % steps == 0:
        print "\b.",
        sys.stdout.flush()
        
print "\b] Downloaded %d wallpapers. %d failed to download." % (validCount, count - validCount)