Decoding JSON file using python

[Karthik Sharma]

I tried modifying the program as follows as per your suggestion.Doesn't seem to work.

import simplejson as json                                                                                                                                                                
import cjson

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"
}

print('json input original  {} \n\n'.format(json_input))

data = json_input['data']

print('data {} \n\n'.format(data))

message = json.loads(data)

print('message {} \n\n'.format(message['Message']))

I get the following error.

Traceback (most recent call last):
  File "test_json.py", line 23, in <module>
    print('message {} \n\n'.format(message['Message']))
TypeError: list indices must be integers, not str
karthik.sharma at aukksharma2:~$ vim test_json.py 





On Thursday, 28 May 2015 11:14:44 UTC+12, Cameron Simpson  wrote:
> On 27May2015 15:23, Karthik Sharma <karthik.sharma at 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 at zip.com.au>
> 
> Here's a great .sig I wrote, so good it doesn't rhyme.
>         Jon Benger <jbenger at agravaine.st.nepean.uws.edu.au>