Proxy Tester

#!/usr/bin/python
##sandm4n
##created: Sun Feb 13 11:35:38 IST 2011

import sys
import urllib2
import socket

def tester(proxy):
    try:
        handler = urllib2.ProxyHandler({'http': proxy})
        interface = urllib2.build_opener(handler)
        interface.addheaders = [('User-agent', 'Mozilla/5.0')]
        urllib2.install_opener(interface)
        request = urllib2.Request(sys.argv[2])
        sock=urllib2.urlopen(request)
    except urllib2.HTTPError, e:
        print "[-]http error code: ", e.code , "on: "+proxy
        return 0
    except Exception, detail:
        print "[-]exception caught: ", detail , "on: "+proxy
        return 0
    return 1

if len(sys.argv) < 4:
    print "[-]usage: "+sys.argv[0]+" <proxy_list> <website_to_test> <testing_timeout>"
    print "[-]eg: "+sys.argv[0]+" proxy.txt http://www.google.com 30"
    sys.exit()

socket.setdefaulttimeout((int)(sys.argv[3]))

try:
    fp = open(sys.argv[1], "r")
except:
    print "[-]file open error! does it exist?"
    sys.exit()

while True:
    proxy = fp.readline()
    if len(proxy)==0:
        print "[+]complete"
        fp.close()
        sys.exit()
    if tester(proxy):
        print "[+]Working: "+proxy
    else:
        print "[-]Not working: "+proxy