def delete_container(sender, instance, using, **kwargs):
    try:
        instance.__class__.objects.filter(
            child_class=instance.child_class,
            slug=instance.slug,
            channel_id=instance.channel_id,
            site_id=instance.site_id
        ).delete()
    except (instance.__class__.DoesNotExist, Channel.DoesNotExist):
        # object not exists
        pass
Elliptic (Cauer) digital and analog filter design.
dataset/ETHPy150Open opps/opps/opps/containers/signals.py/delete_container--crossover with--dataset/ETHPy150Open scipy/scipy/scipy/signal/filter_design.py/ellip