Remove entry from JSON with Python

Question

I have a Python application where the user can insert a name and one or more extensions, the final result looks like this:

{
"sets": [
{
  "name": "first",
  "extensions": ".exe"
},
{
  "name": "second",
  "extensions": [
    ".pdf",
    ".epub"
  ]
},
{
  "name": "third",
  "extensions": [
    ".mp3",
    ".mp4",
    ".wav"
  ]
}
]
}

I want to delete the entry with the name "third", and consequently the correspondent "extensions".

I have tried something like this:

def deleteJson():
    lines = []
    with open("sets.json","r") as json_file:
        for line in json_file.readlines():
            j = json.loads(line)
            if not j['name'] == "third":
               lines.append(line)
    with open("sets.json",'w') as json_file:
        json_file.writelines(join(lines))

gmds · Accepted Answer · 2019-04-23 01:00:52Z

1

Use the json library instead:

import json

with open('sets.json') as f:
    data = json.load(f)

data['sets'] = [sub for sub in data['sets'] if sub['name'] != 'third']

with open('sets.json', 'w') as f:
    json.dump(data, f)

answered Apr 23, 2019 at 1:00

gmds

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