python之在 Python 中解析来自 MapQuest 反向地理编码 api 的数据

我的代码:

from urllib import request 
import json 
 
lat = 31.33 ; long = -84.52 
 
webpage = "http://www.mapquestapi.com/geocoding/v1/reverse?key=MY_KEY&callback=renderReverse&location={},{}".format(lat, long) 
 
response = request.urlopen(webpage) 
json_data = response.read().decode(response.info().get_param('charset') or 'utf-8') 
data = json.loads(json_data) 
print(data) 

这给了我以下错误:

ValueError: Expecting value: line 1 column 1 (char 0) 

我正在尝试从 MapQuest 反向地理编码 api 读取县和州。响应如下所示:

renderReverse({"info":{"statuscode":0,"copyright":{"text":"\u00A9 2015 MapQuest, Inc.","imageUrl":"http://api.mqcdn.com/res/mqlogo.gif","imageAltText":"\u00A9 2015 MapQuest, Inc."},"messages":[]},"options":{"maxResults":1,"thumbMaps":true,"ignoreLatLngInput":false},"results":[{"providedLocation":{"latLng":{"lat":32.841516,"lng":-83.660992}},"locations":[{"street":"562 Patterson St","adminArea6":"","adminArea6Type":"Neighborhood","adminArea5":"Macon","adminArea5Type":"City","adminArea4":"Bibb","adminArea4Type":"County","adminArea3":"GA","adminArea3Type":"State","adminArea1":"US","adminArea1Type":"Country","postalCode":"31204-3508","geocodeQualityCode":"P1AAA","geocodeQuality":"POINT","dragPoint":false,"sideOfStreet":"L","linkId":"0","unknownInput":"","type":"s","latLng":{"lat":32.84117,"lng":-83.660973},"displayLatLng":{"lat":32.84117,"lng":-83.660973},"mapUrl":"http://www.mapquestapi.com/staticmap/v4/getmap?key=MY_KEY&type=map&size=225,160&pois=purple-1,32.84117,-83.660973,0,0,|&center=32.84117,-83.660973&zoom=15&rand=-189494136"}]}]}) 

如何将此字符串转换为可以使用键从中查询的字典？任何帮助，将不胜感激。谢谢!

请您参考如下方法:

首先，去掉 URL 中的回调参数，因为这是导致响应被包装在 renderReverse() 中的原因

网页 = "http://www.mapquestapi.com/geocoding/v1/reverse?key=MY_KEY&location={},{}".format(lat, long)

这将为您提供有效的 json，它应该与您调用的 json.loads 函数一起使用。此时，您可以与字典等数据进行交互，通过键获取县名和州名。 mapquests 构造其 json 的方式非常奇怪，因此看起来您可能必须进行一些字符串匹配才能获得正确的键名。在本例中，“adminArea4Type”设置为“County”，因此您想要访问“adminArea4”键以返回县名。

data['results'][0]['locations'][0]['adminArea4']