我可以让 JSON 加载到 OrderedDict 中吗?
问题描述
好的,我可以在 json.dump
中使用 OrderedDict.也就是说,OrderedDict 可以用作 JSON 的输入.
Ok so I can use an OrderedDict in json.dump
. That is, an OrderedDict can be used as an input to JSON.
但它可以用作输出吗?如果有怎么办?就我而言,我想 load
到 OrderedDict 中,这样我就可以保持文件中键的顺序.
But can it be used as an output? If so how? In my case I'd like to load
into an OrderedDict so I can keep the order of the keys in the file.
如果没有,是否有某种解决方法?
If not, is there some kind of workaround?
解决方案
是的,你可以.通过为 JSONDecoderobject_pairs_hook 参数>.事实上,这就是文档中给出的确切示例.
Yes, you can. By specifying the object_pairs_hook
argument to JSONDecoder. In fact, this is the exact example given in the documentation.
>>> json.JSONDecoder(object_pairs_hook=collections.OrderedDict).decode('{"foo":1, "bar": 2}')
OrderedDict([('foo', 1), ('bar', 2)])
>>>
您可以将此参数传递给 json.loads
(如果您不需要解码器实例用于其他目的),如下所示:
You can pass this parameter to json.loads
(if you don't need a Decoder instance for other purposes) like so:
>>> import json
>>> from collections import OrderedDict
>>> data = json.loads('{"foo":1, "bar": 2}', object_pairs_hook=OrderedDict)
>>> print json.dumps(data, indent=4)
{
"foo": 1,
"bar": 2
}
>>>
使用 json.load
以同样的方式完成:
Using json.load
is done in the same way:
>>> data = json.load(open('config.json'), object_pairs_hook=OrderedDict)
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