How to parameterize JSON object in a Python script

Question

I am writing a test in Python where i am specifying the JSON sting in a parameter as follows :

json = '...[{"MemberOperand":{
                 "AttributeName":"TEST",
                 "Comparison":"=",
                 "Value":"Test"}
           }]...'

In this example i have the value as "Test" however i want to run the test with several values. Could you guys tell me how can i parameterize The values of "Value"?

Did the json string come from some place else? One usually updates python objects and then jsonizes. If you don't control the source of the json, you could dump, modify and load again. — tdelaney
– tdelaney, Commented Dec 14, 2015 at 6:51

9000 · Accepted Answer · 2015-12-14 06:47:54Z

3

You can construct proper JSON:

import json

the_value = 'Test'

data = [{"MemberOperand": {
    "AttributeName":"TEST",
    "Comparison":"=",
    "Value": the_value}
}]

json_text = json.dumps(data)

answered Dec 14, 2015 at 6:47

9000

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Comments

Learner · Accepted Answer · 2015-12-14 09:02:11Z

1

This is regular dictionary (nested) formatted as string -

def changer(x):
    import json
    d=json.loads(json.loads(json.dumps('[{"MemberOperand":{"AttributeName":"TEST","Comparison":"=","Value":"Test"}}]')))
    d[0]['MemberOperand']['AttributeName']=x
    return d
print changer('New_TEST')

Output-

[{'MemberOperand': {'Comparison': '=', 'AttributeName': 'New_TEST', 'Value': 'Test'}}]

edited Dec 14, 2015 at 9:02

answered Dec 14, 2015 at 6:49

Learner

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Comments

Andriy Ivaneyko · Accepted Answer · 2015-12-14 06:48:29Z

0

Add function which return you different json string all the time by provided value as parameter:

def get_mock_json(value='Test'):
    return '...[{"MemberOperand":{"AttributeName":"TEST","Comparison":"=","Value":%s}}]...'%value


print get_mock_json('test')
print get_mock_json('ttttttest')

edited Dec 14, 2015 at 6:48

answered Dec 14, 2015 at 6:46

Andriy Ivaneyko

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3 Comments

tdelaney Over a year ago

That doesn't work because the json curly brackets are interpreted by format.

tdelaney Over a year ago

Changing to %s dodges one bullet but puts you in line with another... what if the json includes a %s in its text?

Andriy Ivaneyko Over a year ago

that's just for test execution purposes...sure, we could make string interpolation with dict, like that one "(value)%s"%{'value': value}

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