Removing JSON property in array of objects

Question

I have a JSON array that I'm cleaning up in Python. I want to remove the imageData property:

data.json

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

I am setting up a list comprehension to remove the property, but I'm not sure how to create the variable that focuses on imageData:

import json  with open('data.json') as json_data:     data = json.load(json_data)     clean_data = [ item for item in data if not item['imageData'] ]     # Write `clean_data` to new json file 

When I print the list comprehension, it returns an empty array. What do I have to correct to get this working properly?

Answer 1

An easy solution to your problem is deleting the unwanted key in place, with del:

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

You should add some safety checks, but you get the idea.

Answer 2

If not all the elements have an imageData key, then using del will cause an KeyError exception. You could guard against that by using pop with a default:

for item in data:      item.pop('image', None)