Pass a variable to extract from JSON String in Python?

Question

I have below JSON String. Now I want to extract each individual field from that JSON string.

So I decided to create a method parse_json which will accept a variable that I want to extract from the JSON String.

Below is my python script -

#!/usr/bin/python

import json

jsonData = '{"pp": [0,3,5,7,9], "sp": [1,2,4,6,8]}'

def parse_json(data):
    jj = json.loads(jsonData)
    return jj['+data+']

print parse_json('pp')

Now whenever I an passing pp to parse_json method to extract its value from the JSON String, I always get the error as -

return jj['+data+']
KeyError: '+data+'

Any idea how to fix this issue? As I need to pass the variable which I am supposed to extract from the JSON String?

Adam Rosenfield · Accepted Answer · 2013-12-26 02:07:05Z

3

You probably just want this:

    return jj[data]

Your code is trying to look up a key named literally '+data+', when instead what you want to do is look up the key with a name of the function's parameter.

answered Dec 26, 2013 at 2:07

Adam Rosenfield

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falsetru · Accepted Answer · 2013-12-26 02:07:15Z

2

Just use data parameter itself.

Replace following line:

return jj['+data+'] # lookup with `+data+`, not `pp`

with:

return jj[data]

answered Dec 26, 2013 at 2:07

falsetru

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