argparse - Python Port Scanner with arg parser doesn't properly take multiple arguments -


i trying update code great albeit dated book called "violent python." many of examples used deprecated optparse library , have switched argparse in examples, however, modified code doesn't work particular script if use more 1 port argument. became frustrated attempted use original example, code not work @ all.

what works...

python portscan.py -h ipaddress -p 21  [+] scan results for: (banner) [-]21/tcp closed port

what doesn't work...

python portscan.py -h ipaddress -p 21, 22  usage: usage%prog -h  <target host> -p <target port> [-h] [-h tgthost]                                                  [-p [tgtport [tgtport ...]]] usage%prog -h  <target host> -p <target port>: error: argument -p/--tgtport:   invalid int value: '21,'

i realize because argparse takes multiple values 1 argument , turns them list, have tried multiple methods mapping list integer values. fail. appreciate insight ladies , gents can give!

here's code below...

import argparse socket import * threading import *  screenlock = semaphore(value=1) def connscan(tgthost, tgtport):     try:         connskt = socket(af_inet, sock_stream)         connskt.connect((tgthost, tgtport))         connskt.send('violentpython\r\n')         results = connskt.recv(100)         screenlock.acquire()         print '[+]%d/tcp open port '% tgtport #+ str(tgtport)         print '[+] ' + str(results)     except:         screenlock.acquire()         print '[-]%d/tcp closed port '% tgtport #+ str(tgtport)     finally:         screenlock.release()         connskt.close() def portscan(tgthost, tgtports):     try:         tgtip = gethostbyname(tgthost)     except:         print "[-] cannot resolve '%s': unknown host"%tgthost         return     try:         tgtname = gethostbyaddr(tgtip)         print '\n[+] scan results for: ' + tgtname[0]     except:         print '\n[+] scan results for: ' + tgtip         setdefaulttimeout(1)     tgtport in tgtports:         t = thread(target=connscan, args=(tgthost, tgtport))         t.start()  def main():     parser = argparse.argumentparser("usage%prog " "-h  <target host> -p <target port>")     parser.add_argument('-h', '--tgthost', help='specify target host')     parser.add_argument('-p', '--tgtport', nargs= '*', type=int, help='specify target port')     args = parser.parse_args()     tgthost = args.tgthost     tgtports = args.tgtport #str(args.tgtport).split(',')     if (tgthost == none) | (tgtports == none):         print parser.usage         exit(0)     portscan(tgthost, tgtports) if __name__ == '__main__':     main()

i've tried code. know of time don't use , seperate arg values. instead, use space:

>python port_scanner.py -h 127.0.0.1 -p 21 22  [+] scan results for: localhost [-]21/tcp closed port [-]22/tcp closed port

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