#!/usr/bin/env python3
import csv
import json
from collections import defaultdict


def rec_dd():
    return defaultdict(rec_dd)

d = {'countries': rec_dd()}

with open('vassilis.csv') as csvfile:
    reader = csv.DictReader(csvfile)

    for row in reader:
        d['countries'][row['country_origin']][row['year']][row['month']] = row['value']

print(json.dumps(d))