Proof of concept code to solve the problem of how to build a sitemap or file system tree.

sitemap.py

import os
from pprint import pprint

MAP = {}

CHILDREN_KEY = 'children'


for path, _, filenames in os.walk('./templates'):
    path = path.split("/")[2:]
    spot = MAP
    for p in path[:-1]:
        spot = spot[p]
    try:
        spot[path[-1]] = {CHILDREN_KEY: filenames}
    except IndexError:
        spot[CHILDREN_KEY] = filenames

pprint(MAP, indent=4)