如何从JSON字符串中提取N级对象

Question

I want to extract wind object's data from the following JSON string:

import pandas as pd
from urllib2 import Request, urlopen
import json
from pandas.io.json import json_normalize

request=Request('...')
response_weather = urlopen(request)
w = response_weather.read()
metar = json.loads(w)
wind = pd.DataFrame(json_normalize(metar['wind']))
print wind


KeyError: 'wind'

Answer 1

To get to the wind object, you first have to get the conditions object out of metar . Once you have the conditions object, you can then pull out the wind object.

Metar doesn't have a wind child, so metar['wind'] doesn't access anything. metar['conditions'] will work, because there is a conditions child .

Hope that helps!

Answer 2

I want to extract wind object's data

Then you want you want metar['conditions']['wind']

And based on your screenshot, that key contains the following object: {direction: 60, directionIsVariable: false, speedKnots: "3.00"}

_{PS Since that's a single object, I'm not sure what you want to achieve by making it into a pandas.DataFrame}