quick script to use to check whether or not a port is open using python standard library, good for when telnet is unavailable and it's too much trouble to install it

check_port.py

#!/usr/bin/env python
'''
quick script to use to check whether or not a port is open using python standard library,
good for when telnet is unavailable and it's too much trouble to install it
Usage: ./check_port.py 127.0.0.1 5601
Thanks to mrjandro on SO
http://stackoverflow.com/questions/19196105/python-how-to-check-if-a-network-port-is-open-on-linux

sample output:
{"exit_code": 1, "results": "Port not open", "port": 5672, "host_ip": "['11.22.111.200']", "address": "internal-lb-1912362693.us-east-1.elb.amazonaws.com"}
{"exit_code": 0, "results": "Port open", "port": 443, "host_ip": "['11.22.111.200']", "address": "www.google.com"}
'''

import socket;
import sys
import json

ip = sys.argv[1]
prt = sys.argv[2]

hostips = [x for x in socket.gethostbyname_ex(socket.gethostname())[2] if not x.startswith("127.")][:1]

dresult = {'address': ip, 'port': 0, 'results': '', 'exit_code': 1, 'host_ips': hostips}

def dumpresult(d):
    print(json.dumps(d))

try:
    int_prt = int(prt)
    dresult['port'] = int_prt
except:
    msg = ("Error processing port number, is it a number?")
    dresult['results'] = msg
    dumpresult(dresult)
    sys.exit(1)

sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
sock.settimeout(2)
result = sock.connect_ex((ip,int_prt))

if result == 0:
    msg = "Port open"
    dresult['results'] = msg
    dresult['exit_code'] = 0
    dumpresult(dresult)
    sys.exit(0)
else:
    msg = "Port not open"
    dresult['results'] = msg
    dresult['exit_code'] = 1
    dumpresult(dresult)
    sys.exit(1)