Mapbox API formatting

Mapbox example

import os

accessToken = os.environ["MAPBOX_API_KEY"]

@app.route('/route_directions')
def get_directions_geojson():
    """Get directions via Mapbox Directions API with all the waypoints in the session."""

    waypoints = session['waypoints']
    route_list = []

    for waypoint in waypoints:
        lng = str(waypoint['coordinates'][0]) 
        lat = str(waypoint['coordinates'][1]) 
        pair = lng + ',' + lat
        route_list.append(pair)
 
    route_list = ';'.join(route_list)

    url = "https://api.mapbox.com/directions/v5/mapbox/walking/%s.json?access_token=%s&geometries=geojson&steps=true" % (route_list, accessToken)

    response = requests.get(url)
    response = response.json()

    return jsonify(response)