How to write a JS null to file in Python instead of 'null' as a string

Question

My problem is that I need to write a null object to a file, for use in JavaScript.

When I write 'null' JavaScript understands it as a string.

For example in Python:

null_list = ['null']*10
# output: ['null','null','null','null','null','null','null','null','null','null']

While in JavaScript I need :

[null, null, null, null, null, null, null, null, null, null]

Your question is *horrifyingly* unclear. What do you want the file to contain? How are you writing it? — SLaks, Jul 03 '13 at 16:11
Do you mean that you want to print the list without the `"` around `null`? — aldeb, Jul 03 '13 at 16:16
Sorry for the confused statement above, thanks all you guys. — Kimmi, Jul 03 '13 at 16:29

score 4 · Accepted Answer · edited May 23 '17 at 11:43

4

Try using the built-in module json to convert Python's None to the JS null.

>>> import json
>>> null_list = [None]*10
>>> null_list
[None, None, None, None, None, None, None, None, None, None]
>>> json.dumps(null_list)
'[null, null, null, null, null, null, null, null, null, null]'

(As suggested in this answer to a similar question.)

edited May 23 '17 at 11:43

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answered Jul 03 '13 at 16:18

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How to write a JS null to file in Python instead of 'null' as a string

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