Change JSON object values in a Pythonic way

Question

I have the following JSON object and I need to replace all None values with 0 (zero) within parameters keys.

{
  "parameters": {
    "x_pos": 0,
    "y_pos": None,
    "x_pos": 0,
    "...": None,
  },
}

I'm wondering if this can be done in a Pythonic way? And what that way is called (for example, List Comprehension). I think it might look something like this:

params = j_obj.get('parameters')
for param in params:
  params[param] = params.get(param) if params.get(param) is not None else 0

Ajax1234 · Accepted Answer · 2021-05-19 16:27:46Z

1

You can use a dictionary comprehension:

j_obj['parameters'] = {a:0 if b is None else b for a, b in j_obj['parameters'].items()}

answered May 19, 2021 at 16:27

Ajax1234

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3 Comments

meetnick Over a year ago

Thank you! is there any place I can study more about this kind of solution? For example, know all kinds of "comprehension" in python. You just taught me dictionary comprehension which I had no idea it existed, thank you for this!

Ajax1234 Over a year ago

@meetnick This is a good summary of both list and dictionary comprehensions. For reference, here is the official PEP on dictionary comprehension.

Ajax1234 Over a year ago

@meetnick Glad to help!

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