tree_of_taxonomy.py

from collections import defaultdict


def tree(): return defaultdict(tree)

groups = tree()

with open('taxonomy.en-US.txt') as file:
    for row in file.readlines():
        items = row.split(' > ')
        print(items)
        
        foo = groups

        for item in items:
            foo = foo[item]

import pprint
out_file = open('out.txt', 'w')
pprint.pprint(groups, out_file)