Greater than:
Person.objects.filter(age__gt=20)
Greater than or equal to:
Person.objects.filter(age__gte=20)
Less than:
Person.objects.filter(age__lt=20)
Less than or equal to:
Person.objects.filter(age__lte=20)
You can find them all in [the documentation].(https://docs.djangoproject.com/en/stable/ref/models/querysets/).