将元素添加到python中的json
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Add element to a json in python
提问by Biribu
I am trying to add an element to a json file in python but I am not able to do it.
我正在尝试向 python 中的 json 文件添加一个元素,但我无法做到。
This is what I tried untill now (with some variation which I deleted):
这是我到目前为止所尝试的(我删除了一些变化):
import json
data = [ { 'a':'A', 'b':(2, 4), 'c':3.0 } ]
print 'DATA:', repr(data)
var = 2.4
data.append({'f':var})
print 'JSON', json.dumps(data)
But, what I get is:
但是,我得到的是:
DATA: [{'a': 'A', 'c': 3.0, 'b': (2, 4)}]
JSON [{"a": "A", "c": 3.0, "b": [2, 4]}, {"f": 2.4}]
Which is fine because I also need this to add a new row instead an element but I want to get something like this:
这很好,因为我还需要它来添加一个新行而不是一个元素,但我想得到这样的东西:
[{'a': 'A', 'c': 3.0, 'b': (2, 4), "f":2.4}]
How should I add the new element?
我应该如何添加新元素?
采纳答案by Jayanth Koushik
You can do this.
你可以这样做。
data[0]['f'] = var
回答by Vincent Claes
alternatively you can do
或者你可以做
iter(data).next()['f'] = var
回答by Johan Sulaiman
One possible issue I see is you set your JSON unconventionally within an array/list object. I would recommend using JSON in its most accepted form, i.e.:
我看到的一个可能的问题是您在数组/列表对象中非常规地设置了 JSON。我会建议使用 JSON 以其最被接受的形式,即:
test_json = { "a": 1, "b": 2}
Once you do this, adding a json element only involves the following line:
执行此操作后,添加 json 元素仅涉及以下行:
test_json["c"] = 3
This will result in:
这将导致:
{'a': 1, 'b': 2, 'c': 3}
Afterwards, you can add that json back into an array or a list of that is desired.
之后,您可以将该 json 添加回所需的数组或列表中。

