django signals.post_save() and conditions.

Is there a way to check a condition on sender model before processing a command. My code

user_logged_in.connect(update_last_login)

def create_activation_code(sender, instance, created, **kwargs):

    print 'The signal is called'

    if created:

        print 'the singal goes to created'

        if not instance.is_active:

            print 'the signal evaluates the active state'

            activation = Activation.objects.create(user=instance)

            activation.get_code()

            activation.save()

        else:

            print 'the signal fails to evaluate active state'

signals.post_save.connect(create_activation_code, sender=User)

can conditions be applied on signals?

//ysfjwd

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