Python - append data to a json file

Question

I have the following data in my c.json file:

{
    "192.168.0.129": {
        "username": "me", 
        "streaming": "Spotify", 
        "name": "John", 
        "email": "[email protected]"
    }
}

and this other data that I want to append it to:

new_data = {'next_songs': ['song1', 'song2']}

for that purpose I'm doing this:

with open('c.json', 'r') as json_data: 
    data = json.load(json_data)

data.update(new_data)

with open('c.json', 'w') as json_data: 
    json.dump(data, json_data, indent=4)

this works, but no quite, because I get:

{
    "next_songs": [
        "song1", 
        "song2"
    ], 
    "192.168.0.129": {
        "username": "me", 
        "streaming": "Spotify", 
        "name": "John", 
        "email": "[email protected]"
    }
}

and I want appended data to be a value under the key "192.168.0.129", like so:

{
    "192.168.0.129": {
        "username": "me", 
        "streaming": "Spotify", 
        "name": "John", 
        "email": "[email protected]"
        "new_data": ["song1", "song2"], 
    }
}

how do I achieve this?

RomanPerekhrest · Accepted Answer · 2017-10-23 18:13:51Z

1

Only a certain dict property "192.168.0.129"(which is the inner dict) should be updated, not the whole main dict:

...
data["192.168.0.129"].update(new_data)

answered Oct 23, 2017 at 18:13

RomanPerekhrest

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Comments

Jack Homan · Accepted Answer · 2017-10-23 18:15:02Z

1

It looks like you may be updating the wrong dictionary

data.update(new_data) should be data["192.168.0.129"].update(new_data)

answered Oct 23, 2017 at 18:15

Jack Homan

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