pythonjsonpython-3.xlist

JSON writes one list element per line

Writing a list to a JSON file writes one element at per line.

How can I write a list to one line, maintaining its dtype?

separators=(','... is enforcing this (needed for separating key-value pairs). How can I make an exception clause for lists?

import json

my_list = [1, 2, 3]

data = {
  'my_list': my_list 
}

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

test.json

data = {
    'my_list': [
                    1,
                    2,
                    3
               ],
    'another key': "val"
}

Desired output:

data = {
    'my_list': [1, 2, 3],
    'another key': "val"
}
Solution

  • For what I am looking for, YAML is the best alternative. It allows you to write what would be Python lists on one line.