lil_spider.py

import urllib3
import signal


class TimeoutException(Exception):
    pass


def timeout_handler(signum, frame):
    raise TimeoutException


def main():

    signal.signal(signal.SIGALRM, timeout_handler)  # I control the timeout

    block = "138.68.30."
    http = urllib3.PoolManager()

    for i in range(5, 200):

        signal.alarm(3)

        try:
            try:
                ip = block + str(i)
                r = http.request('GET', ip)
                if r.status == 200:
                    print('live site found ' + str(ip))
            except:
                print('nothing found on ' + str(ip))

        except TimeoutException:
            print('ip timed out ' + str(ip))
            continue  # continue the for loop if function A takes more than 5 second
        else:
            signal.alarm(0)


if __name__ == "__main__":
    main()