portScan.py

#!/usr/bin/python
# -*- coding:utf-8 -*-

from socket import *

rhost=raw_input("host:")
fromport=int(raw_input("from port:"))
toport=int(raw_input("to port:"))

print "scan start"

for i in range(fromport, toport):
  s=socket(AF_INET, SOCK_STREAM)

  if s.connect_ex((rhost,i))==0:
    print i,"is open"

s.close()

print "scan finish"