This Python Script downloads a file from internet at set intervals. Useful for data/log file downloads

timed-download.py

#!/usr/bin/env python

import os
import sys
import urllib2
import time

from datetime import datetime

# The following parameters can be changed to suite the requirements of user
url = "http://apps.arunmozhi.in/GPRS_Usage.html"
hr = 0
mi = 1
sec = 0
interval = (hr*3600)+(mi*60)+sec

def constructFilename(url):
    today = datetime.now()
    fil, ext = os.path.splitext(url.split("/")[-1])
    fil += today.strftime('_%Y_%m_%d')
    filename = fil+ext
    return filename

def main():
    print "Opening URL: %s" % (url)
    print "Date & Time: "+datetime.now().__str__()
    f = urllib2.urlopen(url)
    filesize = float(f.info().getheader("Content-Length"))
    if filesize == None:
        print "FileSize Error"
    else:
        filename = constructFilename(url)
        local = open(filename,"wb")
        bytesRead = 0.0
        oldpercent = 0
        for line in f:
            bytesRead += len(line)
            newpercent = 100*bytesRead/filesize
            if newpercent-oldpercent > 1:
                print "%s: %.02f/%.02f kb (%d%%)" %(
                    filename,
                    bytesRead/1024.0,
                    filesize/1024.0,
                    newpercent
                )
                oldpercent = newpercent
            local.write(line)
        local.close()
        f.close()
        if bytesRead == filesize:
            print "File download Done!"
        else:
            print "Error: File download interupted"

if __name__ == '__main__':
    while(1):
        main()
        time.sleep(interval)

Clean and simple ! Good Job