flask_cities.py

import os, sys

from flask import Flask
from flask import request
from flask import Response, send_from_directory
import flask
from pathlib import Path
app = Flask(__name__)

@app.route('/')
def popo():
    return (
        open('city_cold.html', encoding='utf8').read().replace(
        '//GAGABOUDOU',
        ("var city_data = "
            +open('cities_pop_price_latlon.nogit.json',
                encoding='utf8').read()
            +';')
        ))

if __name__ == "__main__":
    app.run(host='localhost', port=5002)