from books.models import Module
import json

def categorize_modules():
    all_nodes = []

    for module in Module.objects.all():
        print(f"{module.get_parent() }         {module.meta_title} :  {module.title}")

        nodes = [i.strip() for i in [module.get_parent().title] + module.meta_title.split(' – ')]
        all_nodes.append(nodes)

    print("")

    for i in range(3):
        leafs = [node[i] for node in all_nodes if len(node) > i+1]
        leafs.sort()
        print(f"{i}.: {set(leafs)}")