def create_from_sequence(bits):
    if len(bits) == 1:
        # Get or create root node
        name = bits[0]
        try:
            # Category names should be unique at the depth=1
            root = Category.objects.get(depth=1, name=name)
        except Category.DoesNotExist:
            root = Category.add_root(name=name)
        except Category.MultipleObjectsReturned:
            raise ValueError((
                "There are more than one categories with name "
                "%s at depth=1") % name)
        return [root]
    else:
        parents = create_from_sequence(bits[:-1])
        parent, name = parents[-1], bits[-1]
        try:
            child = parent.get_children().get(name=name)
        except Category.DoesNotExist:
            child = parent.add_child(name=name)
        except Category.MultipleObjectsReturned:
            raise ValueError((
                "There are more than one categories with name "
                "%s which are children of %s") % (name, parent))
        parents.append(child)
        return parents
Create categories from an iterable
dataset/ETHPy150Open django-oscar/django-oscar/src/oscar/apps/catalogue/categories.py/create_from_sequence