使用Python/Pandas处理嵌套在JSON中的JSON

问题描述

我正在尝试使用python加载JSON数据，但是它看起来像这样:

I am trying to load JSON data using python, however, it looks like this:

{
    "instrument" : "EUR_USD",
    "granularity" : "D",
    "candles" : [
        {
            "time" : "2014-07-02T04:00:00.000000Z", // time in RFC3339 format
            "openMid" : 1.36803,
            "highMid" : 1.368125,
            "lowMid" : 1.364275,
            "closeMid" : 1.365315,
            "volume" : 28242,
            "complete" : true
        },
        {
            "time" : "2014-07-03T04:00:00.000000Z", // time in RFC3339 format
            "openMid" : 1.36532,
            "highMid" : 1.366445,
            "lowMid" : 1.35963,
            "closeMid" : 1.3613,
            "volume" : 30487,
            "complete" : false
        }
    ]
}

我的问题是，当我使用熊猫加载时，仪器，粒度和蜡烛被作为列标题处理.但是，我想使用 time，openMid，highMid，lowMid，closeMid，volume和complete 来创建我的列.但是它们只是被当作蜡烛的一部分来处理.关于如何实现此目标的任何想法?谢谢

My problem is that when I load it using Pandas, instrument, granularity, and candles are processed as the column titles. However, I want to use time, openMid, highMid, lowMid, closeMid, volume, and complete to create my columns. But they are just processed as a belonging to candles. Any ideas on how I can accomplish this? Thanks

推荐答案

您必须首先使用json库读取字符串:

You'll have to read the string using the json library first:

import json
data = json.loads(string)

然后您可以从生成的字典中提取蜡烛数据并以这种方式构建DataFrame，例如:

And then you can extract the candles data from the resulting dictionary and build your DataFrame that way, e.g.:

candles_data = data.pop('candles')
df = pd.DataFrame(candles_data)
for k, v in data.iteritems():
    df[k] = v

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