Stuff

import urllib, sys, timeif len(sys.argv) < 4 :    print "Usage: cam_down.py [url] [filename prefix] [filename extension]"    print "Example: cam_down.py http://www.bt.no/template/ver1-0/gfx/kamera/mob17_12.jpg btcam jpg"    sys.exit()previous_data = ""while True :    try :        #print "Downloading", sys.argv[1]        f = urllib.urlopen(sys.argv[1])        data = f.read()        f.close()    except :        print "Download failed"        data = ""            if len(data) and data != previous_data :        #print "Got new content, saving"        filename = sys.argv[2] + time.strftime("%Y-%m-%d_%H-%M-%S") + "." + sys.argv[3]        of = open(filename, "wb")        of.write(data)        of.close()                previous_data = data            time.sleep(10)