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Date: Thu, 28 May 2015 08:52:49 +1000
From: Cameron Simpson <cs@zip.com.au>
To: python-list@python.org
Subject: Re: Decoding JSON file using python
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Xref: csiph.com comp.lang.python:91334

On 27May2015 15:23, Karthik Sharma <karthik.sharma@gmail.com> wrote:
>I have the JSON structure shown below and the python code shown below to manipulate the JSON structure.
>
>    import json
>
>    json_input = {
>        "msgType": "0",
>        "tid": "1",
>        "data": "[{\"Severity\":\"warn\",\"Subject\":\"Reporting \",\"Message\":\"tdetails:{\\\"Product\\\":\\\"Gecko\\\",\\\"CPUs\\\":8,\\\"Language\\\":\\\"en-GB\\\",\\\"isEvent\\\":\\\">
>        "Timestamp": "1432703193431",
>        "Host": "myserver.com",
>        "Agent": "Experience",
>        "AppName": "undefined",
>        "AppInstance": "my_server",
>        "Group": "UndefinedGroup"
>    }
>
>
>    data = json_input['data']
>    tdetails = data['Message']
>    print('json_input {} \n\ndata {} \n\n tdetails {}\n\n'.format(json_input,data,tdetails))
>
>I am getting the error.
>
>    Traceback (most recent call last):
>      File "test_json.py", line 19, in <module>
>        tdetails = data['Message']
>    TypeError: string indices must be integers, not str

That will be because of this line:

  tdetails = data['Message']

because "data" is just the string from your dict.

>The JSON structure is valid as shown by http://jsonlint.com/
>   I want to be able to access the different fields inside `data` such as `severity`, `subject` and also fields inside `tdetails` such as `CPUs` and `Product`. How do I do this?

Then you need to decode "data". Example (untested):

  data_decoded = json.loads(data)

and then access:

  data_decoded['Message']

Cheers,
Cameron Simpson <cs@zip.com.au>

Here's a great .sig I wrote, so good it doesn't rhyme.
        Jon Benger <jbenger@agravaine.st.nepean.uws.edu.au>