post_save hook and models

models.py

import sys, traceback
from django.db import models
import django_monitor
import xmlrpclib

class TVShow(models.Model):
    active = models.BooleanField(default=False)
    name = models.CharField(blank=False, max_length=20)
    description = models.TextField(blank=False)
    terms = models.CharField(blank=False, max_length=50)

    def __unicode__(self):
        return "%s%s" % (self.name, '(Activo)' if self.active else '')

class Update(models.Model):

    username = models.CharField(blank=False, max_length=20)
    message = models.TextField(blank=False)
    show = models.ForeignKey('TVShow', related_name='updates')
    created_at = models.DateTimeField(auto_now_add=True)

    def __unicode__(self):
        return "From @%s: %s" % (self.username, self.message)

    class Meta:
        pass

django_monitor.nq(Update)
django_monitor.nq(TVShow)

def show_post_save(sender, instance, **kwargs):
    stopped = ''
    started = ''
    print "Post-save hook"

    try:
        s = xmlrpclib.ServerProxy('http://django:djangosupervctl@localhost:9001')
        stopped = s.supervisor.stopProcessGroup('twitterstream', True)
        print "Stopped: " , stopped
        actives = TVShow.objects.filter(active=True)
        if len(actives) > 0 or kwargs.get('instance').active == True:
            started = s.supervisor.startProcess('twitterstream', True)
            print "Started: " , started
    except:
        print "Exception"
        print "Started: " , started
        print "Stopped: " , stopped
        traceback.print_exc(file=sys.stdout)

models.signals.post_save.connect(show_post_save, sender=TVShow)