Using variable in an API request in Python

Question

I would like to know how to use a variable in the following API call:

 response=requests.get('https://api.darksky.net/forecast/f3bc3bd870812cc013666f2bfb75b45d/50,1,2019-11-18T22:05:45+00:00')

instead of the random values 50 and 1 in this example, I would like to put my variables for latitude and longitude, integrated in a for loop. When I try this is not working and a 400 error happens. Is it a syntax error or is it impossible ? I read the whole documentation of this API and nothing indicates that it's impossible.

[EDIT]Example of a try :

for i in range(0,precision):


    response=requests.get('https://api.darksky.net/forecast/f3bc3bd870812cc013666f2bfb75b45d/latitude[i],longitude[i],2019-11-18T22:05:45+00:00')
    json_data = json.loads(response.text)  

    wind_speed[i]=json_data["currently"]["windSpeed"]
    wind_dir[i]=json_data["currently"]["windBearing"]

In this example for i=0, latitude[i]=51.4888 and longitude[i]=-3.16657

and here is the error message


  File "C:/Users/ab79/Documents/GPX WEATHER/test.py", line 8, in <module>
    print(json_data["currently"]["windSpeed"])

KeyError: 'currently'

can you give us an example of the lat/long coordinates you're trying? — wpercy, Nov 19 '19 at 23:05
Use an _f-string_? `f'https://api.darksky.net/forecast/f3bc3bd870812cc013666f2bfb75b45d/{latitude[i]},{longitude[i]},2019-11-18T22:05:45+00:00'` — Alexander, Nov 19 '19 at 23:13
Possible duplicate of [String formatting in Python](https://stackoverflow.com/questions/517355/string-formatting-in-python) — Cristian Ciupitu, Nov 19 '19 at 23:25

score 2 · Accepted Answer · answered Nov 19 '19 at 23:14

2

I would do something like this:

base_url = 'https://api.darksky.net/forecast/f3bc3bd870812cc013666f2bfb75b45d/{},{},2019-11-18T22:05:45+00:00'
url = base_url.format(latitude[i],longitude[i])
r = requests.get(url)

data = r.json()

You're running into an issue because you're trying to inject the variables directly into the url string. Try using a .format() (above) or an f-string like this:

url = f'https://api.darksky.net/forecast/f3bc3bd870812cc013666f2bfb75b45d/{latitude[i]},{longitude[i]},2019-11-18T22:05:45+00:00'
r = requests.get(url)
data = r.json()

answered Nov 19 '19 at 23:14

wpercy

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WORKED ! Thank you :D – Antoine Berger Nov 19 '19 at 23:18
1

@AntoineBerger you should also read the documentation for [`str.format`](https://docs.python.org/3/library/stdtypes.html#str.format) to understand what's going on. – Cristian Ciupitu Nov 19 '19 at 23:21
Thanks, i'll do it – Antoine Berger Nov 19 '19 at 23:26

Using variable in an API request in Python

1 Answers1