Removing JSON property in array of objects with Python + Inverse

Question

sample data:

[{"title": "foo", "imageData": "xyz123"}, {"title": "bar", "imageData": "abc123"}, {"title": "baz", "imageData": "def456"}]

this will delete the unwanted key in place, with del, taken from here

import json

with open('data.json') as json_data:
    data = json.load(json_data)
    for element in data: 
        del element['imageData']

what is the inverse of this command del element['imageData']. So i want to delete everything but the imageData key.

Do you want to write the data back to the json file?

alecxe
– alecxe

2016-07-19 02:32:43 +00:00
Commented Jul 19, 2016 at 2:32 — alecxe
– alecxe, Commented Jul 19, 2016 at 2:32

Paluter · Accepted Answer · 2016-07-19 02:34:28Z

1

You could just do this:

temp = data['imageData']
data.clear()
data['imageData'] = temp

The resulting dictionary named data will only contain the key imageData and its associated value

answered Jul 19, 2016 at 2:34

Paluter

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Lex Scarisbrick · Accepted Answer · 2016-07-19 03:12:27Z

1

You could do that with a list comprehension to create a new list with only the element(s) of interest:

import json

with open('data.json') as json_data:
    data = json.load(json_data)
    new_data = [{'imageData': element['imageData']} for element in data]

answered Jul 19, 2016 at 3:12

Lex Scarisbrick

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