data_loader_overpy.py

import os
import json
import time
import overpy


def get_tag_keys_values_options():
    tag_key_value_list = {"restaurant": "amenity", "bank": "amenity", "bar": "amenity", "fuel": "amenity",
                          "fast_food": "amenity", "atm": "amenity", "hospital": "amenity", "pharmacy": "amenity",
                          "library": "amenity", "books": "shop", "park": "leisure", "station": "public_transport",
                          "alcohol": "shop", "bakery": "shop", "bicycle": "shop", "post_office": "amenity"}
    tag_keys = list(set(tag_key_value_list.values()))
    tag_values = list(set(tag_key_value_list.keys()))
    return tag_keys, tag_values, tag_key_value_list


def get_country_codes():
    country_codes = [
        "BE", "BG", "CZ", "DK", "DE", "EE", "IE", "EL", "ES", "FR", "HR", "IT", "CY",
        "LV", "LT", "LU", "HU", "MT", "NL", "AT", "PL", "PT", "RO", "SI", "SK", "FI",
        "SE", "GR", "GB", "CH", "NO", "IS", "RS", "ME", "MK", "AL", "BA"
    ]
    return sorted(country_codes)


def get_data_overpy(country_iso_a2, tag_key, tag_value):
    names = []
    lats = []
    longs = []
    websites = []
    temp_dir = "temp"
    file_path = f'{temp_dir}/{country_iso_a2}_{tag_key}_{tag_value}.json'

    # if cached version exists and is not older than 24h, load from file
    if os.path.exists(file_path) and os.path.getctime(file_path) > time.time() - (60 * 60 * 24):
        print('Loading cached data...')
        with open(file_path, 'r') as f:
            data_dict = json.load(f)

    else:
        print('No cached data found, retrieving fresh API data...')
        api = overpy.Overpass()
        r = api.query("""
                ( area["ISO3166-1"="{0}"][admin_level=2]; )->.searchArea;
                ( node[{1}={2}]( area.searchArea );
                );
                out center;""".format(country_iso_a2, tag_key, tag_value))
        #print(f"Received {len(r.nodes)} nodes for {tag_value}")
        for node in r.nodes:
            try:  # not all entries have a name
                names.append(node.tags.get('name'))
            except KeyError:
                names.append("n/a")

            longs.append(float(node.lon))
            lats.append(float(node.lat))
            websites.append(node.tags.get('website'))

        data_dict = dict(
            names=names,
            longs=longs,
            lats=lats,
            websites=websites
        )

        if len(data_dict['longs']) > 0:
            with open(file_path, 'w') as f:
                json.dump(data_dict, f)

    return data_dict