Python 从嵌套 json 中提取数据时出错

Question

我在论坛 python 中找不到与我的 json 结构类似的解决方案，因此寻求新的帮助。

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}}}

我正在尝试使用以下代码从文件中提取最后一个数据的经纬度并将其传递给 googleAPI 以进行反向地理编码。

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)

如果我对纬度和经度进行硬编码而不是从文件中提取它们（删除整个 json 方面），则代码有效。所以问题出在 extraction.I 我得到的错误是--

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

以我有限的Python知识，我卡住了。

Answer 1

你有一个嵌套字典。使用 last_loc["data"]["coords"]

例如：

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

Python 从嵌套 json 中提取数据时出错

Python Error in extracting data from nested json

json

geolocation

python-2.7

multi-layer