在 Python 中解析来自 MapQuest 反向地理编码 api 的数据？

Question

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 反向地理编码中读取县和州 api。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！

Answer 1

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

中的原因

webpage = "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 构造它们的 json 的方式很奇怪，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。在这种情况下，'adminArea4Type' 设置为 'County'，因此您想要访问 'adminArea4' 键以 return 县名。

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

在 Python 中解析来自 MapQuest 反向地理编码 api 的数据？

Parsing data from MapQuest reverse geocoding api in Python?

python

json

reverse-geocoding

python-3.x

mapquest