queryset.py

class QuerySet:
    """Represent a lazy database lookup for a set of objects."""
    # ...
    @property
    def ordered(self):
        """
        Return True if the QuerySet is ordered -- i.e. has an order_by()
        clause or a default ordering on the model (or is empty).
        """
        if isinstance(self, EmptyQuerySet):
            return True
        if self.query.extra_order_by or self.query.order_by:
            return True
        elif self.query.default_ordering and self.query.get_meta().ordering:
            return True
        else:
            return False