如何对 json 数据进行排序以进行转储？

Question

I am trying to dump JSON data in Python to a file. I receive the data as an ImmutableMultiDict from a Flask post request. It looks as follows: ImmutableMultiDict([('prefix', ''), ('key1', 'value1'), ('key2', 'value2')]) The data should look like this in the file:

{ "prefix": [
    {"key1": "value1"},
    {"key2" : "value2"}
  ]
}

The prefix as well as all the other data is part of the post request. My question now is: How can I json.dump the ImmutableMultiDict so it appears like this in the file? Right now it looks like this:

{
    "prefix": "",
    "key1": "value1",
    "key2": "value2",
}

The reason why I want to do it the other way is because I want to append data later on by appending it to the array with the "prefix" key. Can anyone show me a way to do this properly please?

Thanks.

EDIT:

Ok. I fixed it so it looks the way it should now. The Python code:

def write_to_json(file, data, prefix):
    with open(file, "a", encoding="utf-8") as f:
        json.dump({prefix : list(data)}, f, indent=4)

Result:

{
    "prefix": [
        "key1",
        "key2"
    ]
}

Answer 1

As you did not mentioned anything about it, I'd recommend to check ImmutableMultiDict#to_dict() with flat parameter, see documentation .

Maybe I am understanding incorrectly, but are you trying to have multiple keys for "prefix"? This is opposing to the definition of JSON and will not work as the keys of a dict (MultiDict) uses something like a set for store their keys.