从嵌套json提取数据时的Python错误

Question

我在论坛上找不到类似于python的json结构的解决方案，所以请求新的帮助。

我正在尝试从名为geolocation.json的文件中提取纬度和经度的值，该文件具有以下结构

{"userId":"Geo-data","data": {"mocked":false,"timestamp":1548173963281,"coords":{"speed":0,"heading":0,"accuracy":20.20400047302246,"longitude":88.4048656,"altitude":0,"latitude":22.5757344}}}

我正在尝试下面的代码从文件中提取最后一个数据的纬度和经度，并将其传递给googleAPI进行反向地理编码。

import json
with open("geolocation.json") as geo_file:

   geo_dict = [json.loads(line) for line in geo_file]

for geo in geo_dict:
    last_loc= geo_dict[-1]

    geolat= str(last_loc['latitude'])
    geolong= str(last_loc['longitude'])

    #geolat = format(float(geo['latitude']),'.6f')
    #geolong = format(float(geo['longitude']),'.6f')


from geopy.geocoders import GoogleV3
#geolat='22.5757344'
#geolong='88.4048656'
latlong = [geolat, geolong]
val = ", ".join(latlong)
geolocator = GoogleV3(api_key='My_API_KEY')
locations = geolocator.reverse(val)
if locations:
    print(locations[0].address)

如果我硬编码纬度和经度，而不是从文件中提取它们(删除整个json方面)，代码就能工作。所以问题正在解决，我得到的错误是--

geolat= str(last_loc['latitude'])
KeyError: 'latitude'

以我有限的Python知识，我被困住了。

Answer 1

你有一本嵌套字典。使用last_loc["data"]["coords"]

Ex:

import json
last_loc = json.loads('{"userId":"Geo-data","data": {"mocked":false,"timestamp":1548173963281,"coords":{"speed":0,"heading":0,"accuracy":20.20400047302246,"longitude":88.4048656,"altitude":0,"latitude":22.5757344}}}')
geolat= str(last_loc["data"]["coords"]['latitude'])
geolong= str(last_loc["data"]["coords"]['longitude'])
print(geolat)
print(geolong)

输出：

22.5757344
88.4048656