Port Scan using python

scan.py

#!/usr/bin/env python3
import sys
import socket

def isReachable(ipOrName, port, timeout=2):
    s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
    s.settimeout(timeout)
    try:
        s.connect((ipOrName, int(port)))
        s.shutdown(socket.SHUT_RDWR)
        return True
    except:
        return False
    finally:
        s.close()
if len(sys.argv) < 2:
    print("Usage: scan.py <ip-or-name>")
    exit(1)
ip = sys.argv[1]
for i in range(1,1024):
    if isReachable(ip, str(i)):
        print("{} {}".format(ip, i))