访问JSON元素 [英] Accessing JSON elements

问题描述

我正在从URL获取天气信息.

I am getting the weather information from a URL.

weather = urllib2.urlopen('url')
wjson = weather.read()

我得到的是:

{
  "data": {
     "current_condition": [{
        "cloudcover": "0",
        "humidity": "54",
        "observation_time": "08:49 AM",
        "precipMM": "0.0",
        "pressure": "1025",
        "temp_C": "10",
        "temp_F": "50",
        "visibility": "10",
        "weatherCode": "113",
        "weatherDesc": [{
            "value": "Sunny"
        }],
        "weatherIconUrl": [{
            "value": "http:\/\/www.worldweatheronline.com\/images\/wsymbols01_png_64\/wsymbol_0001_sunny.png"
        }],
        "winddir16Point": "E",
        "winddirDegree": "100",
        "windspeedKmph": "22",
        "windspeedMiles": "14"
    }]        
 }
}

如何访问所需的任何元素?

How can I access any element I want?

如果我这样做:print wjson['data']['current_condition']['temp_C']我收到错误消息:

if I do: print wjson['data']['current_condition']['temp_C'] I am getting error saying:

字符串索引必须是整数，而不是str.

string indices must be integers, not str.

推荐答案

import json
weather = urllib2.urlopen('url')
wjson = weather.read()
wjdata = json.loads(wjson)
print wjdata['data']['current_condition'][0]['temp_C']

您从url中获得的是一个json字符串.而且您不能直接用索引解析它. 您应该通过json.loads将其转换为字典，然后可以使用索引对其进行解析.

What you get from the url is a json string. And your can't parse it with index directly. You should convert it to a dict by json.loads and then you can parse it with index.

不是使用.read()中间将其保存到内存中，然后将其读取到json，而是允许json直接从文件中加载它:

Instead of using .read() to intermediately save it to memory and then read it to json, allow json to load it directly from the file:

wjdata = json.load(urllib2.urlopen('url'))

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