@receiver(pre_delete, sender=Card)
def delete_practice_objects(sender, **kwargs):
    Practice.objects.filter(object_id = kwargs['instance'].ID).delete()
Returns True if the line is a diffscuss header or body line.
dataset/ETHPy150Open DummyDivision/Tsune/deckglue/models.py/delete_practice_objects--crossover with--dataset/ETHPy150Open hut8labs/diffscuss/diffscuss/support/editor.py/LineProperties.is_diffscuss