Download a file every 30 seconds.

30s.py

import argparse
import datetime
import os
from twisted.internet import reactor
from twisted.internet import task

# Download an image from a URL every few seconds

parser = argparse.ArgumentParser(
    description='Download an image from a URL every few seconds.')
parser.add_argument(
    '-u', '--url',
    default='http://www.ek.fi/kamera/kamera.jpg',
    help='The URL of an image to download')
parser.add_argument(
    '-t', '--timeout',
    type=int, default=30,
    help='Seconds to wait between downloads')
parser.add_argument(
    '-o', '--outfile',
    default='palace.jpg',
    help='The suffix appended to a timestamp for saved files')

args = parser.parse_args()
print "URL:               ", args.url
print "Timeout in seconds:", args.timeout
print "Output suffix:     ", args.outfile
format = '%Y-%m-%d_%H%M%S'


def do_work():
    now = datetime.datetime.today()
    print now
    timestring = now.strftime(format)
    print timestring
    outfile = timestring + "_" + args.outfile
    print "Fetching " + args.url + " to " + outfile
    command = "wget " + args.url + " -O " + outfile
    print command
    os.system(command)
    print "Fetched"

    pass

loop = task.LoopingCall(do_work)
loop.start(args.timeout)

reactor.run()

# End of file