解析嵌套的JSON数据 [英] Parsing nested JSON data

问题描述

此JSON输出来自MongoDB聚合查询.我基本上需要将嵌套数据JSON解析为以下的total'和'_id'值.

This JSON output is from a MongoDB aggregate query. I essentially need to parse the nested data JSON down to the following to the 'total' and '_id' values.

{
'ok': 1.0, 
'result': [
            {
                'total': 142250.0, 
                '_id': 'BC'
            }, 
            {
                'total': 210.88999999999996,
                 '_id': 'USD'
            }, 

            {
                'total': 1065600.0, 
                '_id': 'TK'
            }
            ]
}

我尝试了5种不同的技术来获取所需的信息，但是使用json和simplejson模块遇到了问题.

I've tried 5 different techniques to get what I need from it, however I've run into issues using the json and simplejson modules.

理想情况下，输出将是这样的:

Ideally, the output will be something like this:

142250.0, BC
210.88999999999996, USD
1065600.0, TK

推荐答案

注意:您来自MongoDB的JSON响应实际上无效. JSON需要双引号(")，而不是单引号(').

NOTE: Your JSON response from MongoDB is not actually valid. JSON requires double-quotes ("), not single-quotes (').

我不确定您的响应为什么使用单引号而不是双引号，但是从其外观上，您可以替换它们，然后仅使用内置的json模块:

I'm not sure why your response has single-quotes instead of double-quotes but from the looks of it you can replace them and then just use the built-in json module:

from __future__ import print_function
import json

response = """{
    'ok': 1.0, 
    'result': [
        {
            'total': 142250.0, 
            '_id': 'BC'
        }, 
        {
            'total': 210.88999999999996,
             '_id': 'USD'
        }, 

        {
            'total': 1065600.0, 
            '_id': 'TK'
        }
        ]
}"""

# JSON requires double-quotes, not single-quotes.
response = response.replace("'", '"')
response = json.loads(response)
for doc in response['result']:
    print(doc['_id'], doc['total'])

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