我从Simplegeo请求中获取此JSON对象。对于某些区域，您将没有地址数据。在这些情况下，我希望能够使用“子类别”：“县”找到数据中的部分，然后查询相应的名称。
在JSON响应中查找数据位置并获取相应数据的最佳方法是什么？
{
"query": {
"latitude": 34.078195,
"longitude": -118.185497,
"address": "90032",
"confidence": 0.714,
"precision": "zip"
},
"timestamp": 1313717557.449,
"features": [
{
"handle": "SG_13ChTM4q9Qo0OoZI5q453G_34.078617_-118.185973",
"href": "http://api.simplegeo.com/1.0/features/SG_13ChTM4q9Qo0OoZI5q453G_34.078617_-118.185973.json",
"abbr": null,
"attribution": "(c) OpenStreetMap (http://openstreetmap.org/) and contributors",
"classifiers": [
{
"category": "Commercial Area",
"type": "Public Place",
"subcategory": null
}
],
"name": "KMPC-AM",
"license": "http://creativecommons.org/licenses/by-sa/2.0/",
"bounds": [
-118.187194,
34.076831,
-118.184752,
34.080421
]
},
{
"handle": "SG_5zlubcQBdPWX5zY02QtxeT_34.080185_-118.184829",
"name": "06037201401",
"license": "http://creativecommons.org/publicdomain/mark/1.0/",
"bounds": [
-118.193786,
34.075513,
-118.178021,
34.086444
],
"href": "http://api.simplegeo.com/1.0/features/SG_5zlubcQBdPWX5zY02QtxeT_34.080185_-118.184829.json",
"abbr": null,
"classifiers": [
{
"category": "US Census",
"type": "Region",
"subcategory": "Tract"
}
]
},
{
"handle": "SG_01i8SelQjR6LBuBBGei63D_34.081001_-118.177407",
"name": "El Sereno",
"license": "Not For Redistribution",
"bounds": [
-118.19758,
34.061731,
-118.155504,
34.105109
],
"href": "http://api.simplegeo.com/1.0/features/SG_01i8SelQjR6LBuBBGei63D_34.081001_-118.177407.json",
"abbr": null,
"classifiers": [
{
"category": "Neighborhood",
"type": "Region",
"subcategory": null
}
]
},
{
"handle": "SG_0Zvp5oQfiIlufuV5WlR0Bs_34.079519_-118.177738",
"name": "90032",
"license": "http://creativecommons.org/publicdomain/mark/1.0/",
"bounds": [
-118.202841,
34.060453,
-118.155292,
34.101921
],
"href": "http://api.simplegeo.com/1.0/features/SG_0Zvp5oQfiIlufuV5WlR0Bs_34.079519_-118.177738.json",
"abbr": null,
"classifiers": [
{
"category": "Postal Code",
"type": "Region",
"subcategory": null
}
]
},
{
"handle": "SG_2EAf2lwKihpnQQbH5qQBow_34.085193_-118.233164",
"name": "Assembly District 45",
"license": "http://creativecommons.org/publicdomain/mark/1.0/",
"bounds": [
-118.344812,
34.040466,
-118.155292,
34.126937
],
"href": "http://api.simplegeo.com/1.0/features/SG_2EAf2lwKihpnQQbH5qQBow_34.085193_-118.233164.json",
"abbr": null,
"classifiers": [
{
"category": "Legislative District",
"type": "Region",
"subcategory": "Provincial (Lower)"
}
]
},
{
"handle": "SG_0iiFtWc7rXBJ6VYl2kuO0L_34.085508_-117.985139",
"name": "Congressional District 32",
"license": "http://creativecommons.org/publicdomain/mark/1.0/",
"bounds": [
-118.196746,
34.001855,
-117.840549,
34.194325
],
"href": "http://api.simplegeo.com/1.0/features/SG_0iiFtWc7rXBJ6VYl2kuO0L_34.085508_-117.985139.json",
"abbr": null,
"classifiers": [
{
"category": "Legislative District",
"type": "Region",
"subcategory": "National"
}
]
},
{
"handle": "SG_7NZeInBzM4Mv73P62VZzjl_34.074117_-117.991920",
"name": "State Senate District 24",
"license": "http://creativecommons.org/publicdomain/mark/1.0/",
"bounds": [
-118.215856,
33.986182,
-117.840549,
34.194731
],
"href": "http://api.simplegeo.com/1.0/features/SG_7NZeInBzM4Mv73P62VZzjl_34.074117_-117.991920.json",
"abbr": null,
"classifiers": [
{
"category": "Legislative District",
"type": "Region",
"subcategory": "Provincial (Upper)"
}
]
},
{
"handle": "SG_63gaN6Xi7zAjBxeFk74UBz_34.106997_-118.411704",
"name": "Los Angeles",
"license": "http://creativecommons.org/publicdomain/mark/1.0/",
"bounds": [
-118.668176,
33.703652,
-118.155289,
34.337306
],
"href": "http://api.simplegeo.com/1.0/features/SG_63gaN6Xi7zAjBxeFk74UBz_34.106997_-118.411704.json",
"abbr": null,
"classifiers": [
{
"category": "Municipal",
"type": "Region",
"subcategory": "City"
}
]
},
{
"handle": "SG_5lHwuPKvcJYpKhy8MR1ZMZ_34.100887_-118.390729",
"name": "Los Angeles Unified School District",
"license": "http://creativecommons.org/publicdomain/mark/1.0/",
"bounds": [
-118.668058,
33.659547,
-118.142667,
34.353672
],
"href": "http://api.simplegeo.com/1.0/features/SG_5lHwuPKvcJYpKhy8MR1ZMZ_34.100887_-118.390729.json",
"abbr": null,
"classifiers": [
{
"category": "School District",
"type": "Region",
"subcategory": "Unified"
}
]
},
{
"handle": "SG_6RRdLsqpHXF3Yu1EXCPORn_33.971007_-117.971917",
"name": "Los Angeles",
"license": "http://creativecommons.org/publicdomain/mark/1.0/",
"bounds": [
-118.991667,
33.391667,
-117.008333,
34.333333
],
"href": "http://api.simplegeo.com/1.0/features/SG_6RRdLsqpHXF3Yu1EXCPORn_33.971007_-117.971917.json",
"abbr": null,
"classifiers": [
{
"category": "Urban Area",
"type": "Region",
"subcategory": null
}
]
},
{
"handle": "SG_6Em6St6NgZtuvorHtngjTU_34.197952_-118.261063",
"name": "Los Angeles",
"license": "http://creativecommons.org/publicdomain/mark/1.0/",
"bounds": [
-118.951721,
32.75004,
-117.645604,
34.823193
],
"href": "http://api.simplegeo.com/1.0/features/SG_6Em6St6NgZtuvorHtngjTU_34.197952_-118.261063.json",
"abbr": null,
"classifiers": [
{
"category": "Administrative",
"type": "Region",
"subcategory": "County"
}
]
},
{
"handle": "SG_2MySaPILVQG3MoXrsVehyR_37.215297_-119.663837",
"name": "California",
"license": "http://creativecommons.org/publicdomain/mark/1.0/",
"bounds": [
-124.482003,
32.528832,
-114.131211,
42.009517
],
"href": "http://api.simplegeo.com/1.0/features/SG_2MySaPILVQG3MoXrsVehyR_37.215297_-119.663837.json",
"abbr": "CA",
"classifiers": [
{
"category": "Subnational",
"type": "Region",
"subcategory": "State"
}
]
},
{
"handle": "SG_3tLT0I5cOUWIpoVOBeScOx_41.316130_-119.116571",
"name": "America/Los_Angeles",
"license": "creativecommons.org/publicdomain/zero/1.0/",
"bounds": [
-124.733253,
32.534622,
-114.039345,
49.002892
],
"href": "http://api.simplegeo.com/1.0/features/SG_3tLT0I5cOUWIpoVOBeScOx_41.316130_-119.116571.json",
"abbr": null,
"classifiers": [
{
"category": "Time Zone",
"type": "Region",
"subcategory": null
}
]
},
{
"handle": "SG_3uwSAEdXVBzK1ZER9Nqkdp_45.687160_-112.493107",
"name": "United States of America",
"license": "http://creativecommons.org/publicdomain/mark/1.0/",
"bounds": [
-179.142471,
18.930138,
179.78115,
71.41218
],
"href": "http://api.simplegeo.com/1.0/features/SG_3uwSAEdXVBzK1ZER9Nqkdp_45.687160_-112.493107.json",
"abbr": null,
"classifiers": [
{
"category": "National",
"type": "Region",
"subcategory": null
}
]
}
],
"weather": {
"wind_speed": "0 meters per second",
"temperature": "84F",
"dewpoint": "57F",
"cloud_cover": "0%",
"wind_direction": "0 degrees",
"forecast": {
"tonight": {
"conditions": "Fog",
"precipitation": "0%",
"temperature": {
"max": "70F",
"min": "66F"
}
},
"tomorrow": {
"conditions": "Clear",
"precipitation": "0%",
"temperature": {
"max": "89F",
"min": "68F"
}
},
"today": {
"conditions": "Mostly clear",
"precipitation": "0%",
"temperature": {
"max": "94F",
"min": "71F"
}
}
},
"conditions": "Clear"
},
"demographics": {
"population_density": 5808,
"acs": {
"error": "You must supply ACS table IDs with demographics.acs__table=<table_id_1>&demographics.acs__table=<table_id_2>... parameters."
}
},
"intersections": [
{
"distance": 277.0035787874508,
"geometry": {
"type": "Point",
"coordinates": [
-118.1874986,
34.0800544
]
},
"properties": {
"highways": [
{
"osm_way_id": "13375722",
"type": "residential",
"name": "Bowman Boulevard"
},
{
"osm_way_id": "13435504",
"type": "residential",
"name": "Verdemour Avenue"
}
],
"attribution": "(c) OpenStreetMap (http://openstreetmap.org/) and contributors",
"license": "http://creativecommons.org/licenses/by-sa/2.0/"
},
"type": "Feature",
"id": "123133103"
},
{
"distance": 278.5007862228104,
"geometry": {
"type": "Point",
"coordinates": [
-118.187905,
34.07971
]
},
"properties": {
"highways": [
{
"osm_way_id": "13375722",
"type": "residential",
"name": "Bowman Boulevard"
},
{
"osm_way_id": "13286592",
"type": "residential",
"name": "Lynnfield Street"
},
{
"osm_way_id": "13435505",
"type": "residential",
"name": "Verdemour Avenue"
}
],
"attribution": "(c) OpenStreetMap (http://openstreetmap.org/) and contributors",
"license": "http://creativecommons.org/licenses/by-sa/2.0/"
},
"type": "Feature",
"id": "122609716"
},
{
"distance": 295.66530721862495,
"geometry": {
"type": "Point",
"coordinates": [
-118.1870694,
34.0805132
]
},
"properties": {
"highways": [
{
"osm_way_id": "13375722",
"type": "residential",
"name": "Bowman Boulevard"
},
{
"osm_way_id": "13468782",
"type": "residential",
"name": "Carter Drive"
}
],
"attribution": "(c) OpenStreetMap (http://openstreetmap.org/) and contributors",
"license": "http://creativecommons.org/licenses/by-sa/2.0/"
},
"type": "Feature",
"id": "123133105"
},
{
"distance": 308.18108469988266,
"geometry": {
"type": "Point",
"coordinates": [
-118.1830009,
34.0763492
]
},
"properties": {
"highways": [
{
"osm_way_id": "13441050",
"type": "residential",
"name": "Richelieu Avenue"
},
{
"osm_way_id": "13470172",
"type": "residential",
"name": "Richelieu Terrace"
}
],
"attribution": "(c) OpenStreetMap (http://openstreetmap.org/) and contributors",
"license": "http://creativecommons.org/licenses/by-sa/2.0/"
},
"type": "Feature",
"id": "123621465"
},
{
"distance": 318.5882396290064,
"geometry": {
"type": "Point",
"coordinates": [
-118.1840727,
34.080806
]
},
"properties": {
"highways": [
{
"osm_way_id": "13313919",
"type": "residential",
"name": "Bedilion Street"
},
{
"osm_way_id": "13468783",
"type": "residential",
"name": "Carter Drive"
}
],
"attribution": "(c) OpenStreetMap (http://openstreetmap.org/) and contributors",
"license": "http://creativecommons.org/licenses/by-sa/2.0/"
},
"type": "Feature",
"id": "122784176"
}
],
"address": {
"geometry": {
"coordinates": [
-118.184913,
34.076448
],
"type": "Point"
},
"properties": {
"address": "4501 Richelieu Ter",
"distance": "0.2",
"postcode": "90032",
"city": "Los Angeles",
"county": "Los Angeles",
"province": "CA",
"country": "US"
},
"type": "Feature"
}
}
答案 0 :(得分：17)
首先，您需要使用json模块将JSON字符串转换为Python字典。
如果data是您的新词典，则您要查找的信息位于data["features"]列表中。您需要遍历此列表并过滤掉您不想要的任何条目。在您的情况下，对于item中的每个data["features"]，您只需要item["classifiers"][0]["subcategory"] == "County"的条目。
您可以在列表推导中完成所有这些操作，例如：
import json
data = json.loads(json_string)
counties = [item for item in data["features"]
if item["classifiers"][0]["subcategory"] == "County"]
这将为您提供每个县的完整字典，如果您只对“名称”字段感兴趣，可以使用此字段：
counties = [item["name"] for item in data["features"]
if item["classifiers"][0]["subcategory"] == "County"]
您提供的JSON对象似乎具有非常一致的格式，但如果情况并非总是这样，您可能需要进行一些额外的检查以确保字典键存在。