Accessing Nested Dictionary - Python

Question

I have below Dictionary those values I am pulling from aws S3 bucket -

{u'Policy': u'{"Version":"2012-10-17","Statement":[{"Sid":"AddPerm","Effect":"Allow","Principal":"*","Action":"s3:GetObject","Resource":"arn:aws:s3:::elliemaetestbucket1/*"},{"Sid":"AddPerm1","Effect":"Allow","Principal":"*","Action":"s3:GetObject","Resource":"arn:aws:s3:::elliemaetestbucket1/*"}]}'}

I want to read "Sid" value and compare it with a string that I am getting from my yaml file. Dictionary can have multiple sids but I need to stop where my sid matches with the string that I am pulling from yaml. I am sure I am missing something very simple. But I have tried almost all the solutions most of the time I get unicode object not callable error. Can somebody please provide some direction on how I can access it. I know this would be something very simple but I am sorry I am stuck at this from 2 days.

You ain't gonna get anywhere without parsing the JSON from your_data["Policy"]. — zwer
– zwer, Commented Jul 23, 2017 at 4:01
What is the type of the data returned from S3? What line of code gives you that "Not callable" error. If its a unicode string, use json.dumps to create a regular json and then extract "Sid" — Vib
– Vib, Commented Jul 23, 2017 at 4:02
Data returned from s3 is Dictionary type. it returns Current_policy which consists of above dict that I mentioned — Ajay Misra
– Ajay Misra, Commented Jul 23, 2017 at 4:05

zwer · Accepted Answer · 2017-07-23 04:05:09Z

3

Your data's Policy key holds a literal JSON, you have to parse it first before you can access its nested fields:

import json

policy = json.loads(your_data["Policy"])

print(policy["Statement"][0]["Sid"])  # Sid of the first Statement
print(policy["Statement"][1]["Sid"])  # Sid of the second Statement

answered Jul 23, 2017 at 4:05

zwer

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1 Comment

Ajay Misra Over a year ago

yayyy I knew it I was doing some stupidity. Thank you so much for your help I really appreciate.

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