CODEWITHSUNDEEP
pythonjsonediting
Rupam Shrivastava
Rupam Shrivastava

Reputation: 23

writing to a json file from python

how do i edit/change a particular field in a json file using python code:

{
   "EZMessage":{
      "action":"account.cash",
      "data":{
         "authToken":"123456",
         "account":"#ACCOUNTID#",
         "portfolio":"true",
         "historical":"true"
      }
   }
}

in this json code, i want to replace 123456 with 789123

string replace only works if i know what is written there. in my code, i would only know what to write, and the identifier "authToken". Is there a way to overwrite the 123456 by identifying that it is the value of "authToken" ?

thanks,

RS

Upvotes: 1

Views: 3963

Answers (2)

tacaswell
tacaswell

Reputation: 87376

Use the json module to convert the string to a set of nested dict objects, make your changes, and then dump the dictionary back to a json string.

import json
jstr = '''{
   "EZMessage":{
      "action":"account.cash",
      "data":{
         "authToken":"123456",
         "account":"#ACCOUNTID#",
         "portfolio":"true",
         "historical":"true"
      }
   }
}'''

j = json.loads(jstr)
j['EZMessage']['data']['authToken'] = 654321
jstr = json.dumps(j)

For how to read-from/write-to a file see the fine tutorial.

Upvotes: 3

Matt Runion
Matt Runion

Reputation: 1071

Convert the JSON object to a Python object, then change the value just like any other Python object.

Upvotes: 2

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