how to add something in JSON file using python?

Question

yeah. (sorry my bad english T_T)

{
  "BlockA": {
    "BlockB": {
      "name": "BlockB",
      "value": "Value_B"
    }
}

this is just my simple json file.

and, i need to change this for

{
  "BlockA": {
    "BlockB": {
      "name": "BlockB",
      "value": "Value_B"
    },
    "BlockC": {
      "name": "BlockC",
      "value": "Value_C"
    }
}

like this, i tried append, json.loads, json.load, json.dumps, json.dump.. but all functions gave me error.

i tried,

import json
f = open(".\simple.json", "r")
json_obj = json.load(f)

#json_obj.append << doesnt work
#json_obj.dump("blahblah", Ensureblahblah=False) << doesnt work too.

using python version 3.4.1

What is the exact error

mmmmmm
– mmmmmm

2014-05-19 14:09:39 +00:00
Commented May 19, 2014 at 14:09 — mmmmmm
– mmmmmm, Commented May 19, 2014 at 14:09
Above written json is invalid too.

Ashwani
– Ashwani

2014-05-19 14:25:49 +00:00
Commented May 19, 2014 at 14:25 — Ashwani
– Ashwani, Commented May 19, 2014 at 14:25

bgusach · Accepted Answer · 2014-05-19 14:19:34Z

4

JSON is just a way to serialize data. If you parse a JSON object, you'll get a python dictionary. If you parse a JSON array, you'll get a python list. If you parse a string, you get a string... etc.

So, if you parse a JS object, you'll get a dictionary. Dictionaries don't have append or dump methods.

This means:

import json
f = open(".\simple.json", "r")
json_obj = json.load(f)  # <--- this is a dictionary!

json_obj['BlockC'] = {'name': '...', 'value': '...'}

And then dump it back to the file (read the json API if you have doubts)

answered May 19, 2014 at 14:19

bgusach

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2 Comments

Blank Over a year ago

sorry for cant choose you,

bgusach Over a year ago

Well, I offered an explanation and you were asking for a solution for your homework.

Fuchida · Accepted Answer · 2014-05-19 15:04:58Z

Here is a code guided explanation

import json

open_file_object = open("/home/action/workspace/playkt/data.json", 'r')
decoded_json = json.load(open_file_object)

print (decoded_json)

"""
{
  "BlockA": {
    "BlockB": {
      "name": "BlockB",
      "value": "Value_B"
    }
  }
}
"""

decoded_json["BlockA"]["BlockC"] = { "name": "BlockC", "value": "Value_C" }

print(decoded_json)

"""
{
    "BlockA": {
        "BlockB": {
            "name": "BlockB",
            "value": "Value_B"
        },
        "BlockC": {
            "name": "BlockC",
            "value": "Value_C"
        }
    }
}
"""

#write to file 
output_file = "/home/action/workspace/playkt/data.json"

with open(output_file, 'w') as write_file_object:
  #Serialize dictionary to a JSON formatted string and write to file
  write_file_object.write(json.dumps(decoded_json))

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