snmp discovery with

#!/usr/bin/env python 
from processing import Process, Queue, Pool 
import time 
import subprocess 
from IPy import IP 
import sys 
from snmp import Snmp 
 
q = Queue() 
oq = Queue() 
#ips = IP("10.0.1.0/24") 
ips = ["10.10.10.28","10.10.10.29","10.10.10.30","10.10.10.31","10.10.10.32","10.10.10.33","10.10.10.34","10.10.10.35","10.10.10.36","10.10.10.37","10.10.10.38","10.10.10.39"] 
num_workers = 10 
 
class HostRecord(object): 
    """Record for Hosts""" 
    def __init__(self, ip=None, mac=None, snmp_response=None): 
        self.ip = ip 
        self.mac = mac 
        self.snmp_response = snmp_response 
    def __repr__(self): 
        return "[Host Record('%s','%s','%s')]" % (self.ip, 
                                            self.mac, 
                                            self.snmp_response) 
 
def f(i,q,oq): 
    while True: 
        time.sleep(.1) 
        if q.empty(): 
            sys.exit() 
            print "Process Number: %s Exit" % i 
        ip = q.get() 
        print "Process Number: %s" % i 
        ret = subprocess.call("ping -c 1 %s" % ip, 
                        shell=True, 
                        stdout=open('/dev/null', 'w'), 
                        stderr=subprocess.STDOUT) 
        if ret == 0: 
            print "%s: is alive" % ip 
            oq.put(ip) 
        else: 
            print "Process Number: %s didn't find a response for %s " % (i, ip) 
            pass 
 
def snmp_query(i,out): 
    while True: 
        time.sleep(.1) 
        if out.empty(): 
            sys.exit() 
            print "Process Number: %s" % i 
        ipaddr = out.get() 
        s = Snmp() 
        h = HostRecord() 
        h.ip = ipaddr 
        h.snmp_response = s.query() 
        print h 
        return h 
try: 
    q.putmany(ips) 
 
finally: 
    for i in range(num_workers): 
        p = Process(target=f, args=[i,q,oq]) 
        p.start() 
    for i in range(num_workers): 
        pp = Process(target=snmp_query, args=[i,oq]) 
        pp.start() 
 
print "main process joins on queue" 
p.join() 
#while not oq.empty(): 
#    print "Validated", oq.get() 
 
 
print "Main Program finished"