Getting a JSON response with requests and ArcGIS REST API

Question

I'm performing a batch download from my AGOL account, and using the ESRI documentation export item I can export content to shapefiles. I would like to then download the newly created shapefiles. In order to accomplish this I have to be able to have the ID number of the newly created shapefile. According to the documentation it is in the JSON response.

sudo code:

import requests
import arcrest
import json

exporturl = self.root_url +'/users/' + self.username + '/export'
export = requests.post(exporturl, params=FsParams)
export_response = export.json()

What I have tried:

response = export_response['exportItemId']
print response

Error: KeyError: 'exportItemId'

printing response = export_response returns the params from the post

Using the requests library can I access the JSON response? If this is not possible with requests what method will work?

Could you provide an example of what export_response and export prints out? Based on your code (looking at it, not trying it), if your URL is correct you should be getting a response.However, a guess might be your syntax of export.json() is wrong, it should be export_respone =json.loads(export) (but just a guess as I stopped using requests — KHibma
– KHibma, Commented Dec 29, 2015 at 16:36
I know that it is not json.loads() as that does not work. I modified the the OP with the error — risail
– risail, Commented Dec 29, 2015 at 16:44
Error is good: its saying the response you got back doesn't have that value in it. do a print export_response and see all the key:values. This will tell you either your initial request is wrong, or hopefully something useful to help you debug in the returned response — KHibma
– KHibma, Commented Dec 29, 2015 at 16:48
@KHibma your suggestion of printing export_response exposed an issue with my first two layers. response = export_response['exportItemId'] worked once I put it in a try clause. If you move that to an answer Ill accept it. — risail
– risail, Commented Dec 29, 2015 at 16:59

KHibma · Accepted Answer · 2015-12-29 17:30:59Z

The code, as posted, is correct when working with requests and json. As indicated from the comments, when making a request over multiple items, you might get a different response back depending on what the original item was requested against.

The error in question, KeyError: 'exportItemId' comes from the fact the response returned a dictionary without the exportItemId key and you tried to access it. There are multiple ways to handle this. A simple try / except as you indicate will allow you to pass over instances when you dont get back a key which you were expecting. Alternatively you could do an explicit check that the key exists in the dictionary before attempting to access it.

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