Sending request from python object

Question

I have a list of tuples that I want to iterate through and send a http request via the python requests module.

api_schedule = [
{'destination': (51.490527, 0.267840), 'id': 'trial_a', 'origin': (51.430732, 0.239308)},
{'destination': (51.429488, 0.239060), 'id': 'trial_b', 'origin': (51.490518, 0.267578)}]

The origin and destination coordinates are proving difficult to format correctly. The Google Directions API expects them in the format lat,lng where the lat and lng are float

I iterate through the list of dictionaries like so:

for pair in api_schedule:
    departure_time = time.time()
    origin_lat = str(pair['origin'][0])
    origin_lng = "," + str(pair['origin'][1])
    origin = origin_lat + origin_lng
    destination_lat = str(pair['destination'][0])
    destination_lng = "," + str(pair['destination'][1])
    destination = destination_lat + destination_lng
    params = {
    "origin" : origin,
    "destination" : destination
    "key" : api_Key,
    "departure_time" : departure_time,
    "mode" : mode
    }
    request = requests.Request('GET', url_raw, params=params).prepare()
    print request.url

However, this returns %2C in place of ,:

https://maps.googleapis.com/maps/api/directions/json?origin=51.430732%2C0.239308&destination=51.490527&destination=0.26784

How do I iterate through a list of tuples like this and use requests to formula the parameters correctly?

When I try without the above manipulation, requests views the origin and destination data as lists and thus creates two params like so:

https://maps.googleapis.com/maps/api/directions/json?origin=51.430732&origin=0.239308

Desired output:

https://maps.googleapis.com/maps/api/directions/json?origin=51.430732,0.239308&destination=51.490527,0.26784

The first question helped me understand why it wasn't working. The field is being converted to a list. This question is how do I solve this problem for this application. — LearningSlowly
– LearningSlowly, Commented Dec 5, 2016 at 9:49
Please define ' formula the parameters correctly': What is the expected URL? — user6999902
– user6999902, Commented Dec 5, 2016 at 9:50
I have added the desired output. https://maps.googleapis.com/maps/api/directions/json?origin=51.430732,0.239308&destination=51.490527,0.26784 instead of https://maps.googleapis.com/maps/api/directions/json?origin=51.430732&origin=0.239308 or https://maps.googleapis.com/maps/api/directions/json?origin=51.430732%2C0.239308&destination=51.490527&destination=0.26784 — LearningSlowly
– LearningSlowly, Commented Dec 5, 2016 at 9:52
%2C is entirely correct and expected in a URL. Google will decode that for you. If you were to use your 'desired output' URL in a browser, your browser would also encode the comma. — Martijn Pieters
– Martijn Pieters, Commented Dec 5, 2016 at 9:59

user6999902 · Accepted Answer · 2016-12-05 09:58:03Z

1

https://maps.googleapis.com/maps/api/directions/json?origin=51.430732%2C0.239308&destination=51.490527,0.26784 and https://maps.googleapis.com/maps/api/directions/json?origin=51.430732,0.239308&destination=51.490527,0.26784 are identical.

It is correct to use %2C instead of , in an URL. Your preparation of params is OK.

answered Dec 5, 2016 at 9:58

user6999902

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