with_populations.py

#!/usr/bin/env python2
# -*- coding: utf-8 -*-
"""
Created on Wed Jul  5 00:19:18 2017

@author: saliksyed
"""
import json


routes = json.loads(open("routes.json").read())

country_to_country_code = json.loads(open("country_name_to_country_code.json").read())

populations = json.loads(open("population_by_country_code.json").read())

country_code_to_feature = {}
for country in routes:
    if country in country_to_country_code:
        code = country_to_country_code[country]
        to_amount = sum(routes[country]["to"].values())
        from_amount = sum(routes[country]["from"].values())
        population = populations[code]
        country_code_to_feature[code] = [to_amount, from_amount, population]
        

print country_code_to_feature