A simple TCP port scanner

#!/usr/bin/python
import socket
import sys

try:
    HOST=sys.argv[1]
except:
    HOST='127.0.0.1'
PORTS=[8, 21, 22, 23, 80, 135, 139, 445, 8080]

for PORT in PORTS:
    s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
    try:
        s.connect((HOST, PORT))
        print "%s:%s is open!" % (HOST, PORT)
    except:
        print "%s:%s is close!" % (HOST, PORT)
    s.close()