Convert JSON nested array to Python nested list in one-liner

Question

I would like to convert JSON nested array to Python nested list with one-liner Python method.

Below is the sample of my JSON nested array:

my_dict = {
    "background": "This is a test text.",
    "person": [
        {"name": "Max", "tranx_info": [
            {"tranx_date":"7/1/2020","amount": 82 },
            {"tranx_date":"27/2/2017","amount":177 }]
        },
        {"name": "Lily", "tranx_info": [
            {"tranx_date":"12/7/1989","amount": 165 },
            {"tranx_date":"28/2/1998","amount": 200 },
            {"tranx_date":"28/2/2098","amount": 34 }]
        }
    ]
}

I assume this will be nested list comprehension in Python? What I had tried so far but I'm only able to make the result into a list:

tranx_date_result = [x["tranx_date"] for y in my_dict["person"] for x in y["tranx_info"]]

#output
>>> ["7/1/2020","27/2/2017","12/7/1989","28/2/1998","28/2/2098"]

I would my "tranx_date" result to be in a nested list; something like this:

tranx_date_result = [["7/1/2020","27/2/2017"],["12/7/1989","28/2/1998","28/2/2098"]]

Any help is appreciated :)

Selcuk · Accepted Answer · 2020-03-25 05:11:43Z

2

Just use nested list comprehensions:

>>> [[x["tranx_date"] for x in y["tranx_info"]] for y in my_dict["person"]]
[['7/1/2020', '27/2/2017'], ['12/7/1989', '28/2/1998', '28/2/2098']]

answered Mar 25, 2020 at 5:11

Selcuk

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