Python - Multi Threaded Port Scanner | Auto host to IP

import sys
import time
import socket
import threading

if len(sys.argv) < 4:
    sys.exit("Usage: {} <Target> <Port Range (E.g: 0-65535)> <Threads> <Delay (E.g: 0.2)>".format(sys.argv[0]))

i = 0

target = sys.argv[1]
ranges = list(map(int, sys.argv[2].split("-")))
threads = int(sys.argv[3])
timeout = float(sys.argv[4])

def check(port):
    try:
        sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
        sock.settimeout(10)

        if sock.connect_ex((target, port)) == 0:
            print("Port found on {}:{}".format(target, port))

        sock.close()
    except socket.error:
        pass

for port in range(ranges[0], ranges[1]+1):
    i += 1

    thread = threading.Thread(target=check, args=(port,))
    thread.start()

    if i == threads:
        thread.join()
        i = 0

    time.sleep(timeout)