Python 访问嵌套的 JSON 数据
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Python Accessing Nested JSON Data
提问by apardes
I'm trying to get the zip code for a particular city using zippopotam.us. I have the following code which works, except when I try to access the post codekey which returns TypeError: expected string or buffer
我正在尝试使用 zippopotam.us 获取特定城市的邮政编码。我有以下代码有效，除非我尝试访问post code返回的密钥TypeError: expected string or buffer
r = requests.get('http://api.zippopotam.us/us/ma/belmont')
j = r.json()
data = json.loads(j)
print j['state']
print data['places']['latitude']
Full JSON output:
完整的 JSON 输出：
{
"country abbreviation": "US",
"places": [
{
"place name": "Belmont",
"longitude": "-71.4594",
"post code": "02178",
"latitude": "42.4464"
},
{
"place name": "Belmont",
"longitude": "-71.2044",
"post code": "02478",
"latitude": "42.4128"
}
],
"country": "United States",
"place name": "Belmont",
"state": "Massachusetts",
"state abbreviation": "MA"
}
Thanks for your help.
谢谢你的帮助。
采纳答案by apardes
I did not realize that the first nested element is actually an array. The correct way access to the post code key is as follows:
我没有意识到第一个嵌套元素实际上是一个数组。获取邮编key的正确方式如下：
r = requests.get('http://api.zippopotam.us/us/ma/belmont')
j = r.json()
print j['state']
print j['places'][1]['post code']
回答by agrinh
Places is a list and not a dictionary. This line below should therefore not work:
Places 是一个列表而不是字典。因此，下面的这一行应该不起作用：
print data['places']['latitude']
You need to select one of the items in places and then you can list the place's properties. So to get the first post code you'd do:
您需要在场所中选择一项，然后您可以列出场所的属性。因此，要获得您要做的第一个邮政编码：
print data['places'][0]['post code']
回答by MONTYHS
In your code j is Already json data and j['places'] is list not dict.
在您的代码中， j 已经是 json 数据，而 j['places'] 是 list 而不是 dict。
r = requests.get('http://api.zippopotam.us/us/ma/belmont')
j = r.json()
print j['state']
for each in j['places']:
print each['latitude']
回答by Ezequiel Bertti
I'm using this lib to access nested dict keys
我正在使用这个库来访问嵌套的字典键
https://github.com/mewwts/addict
https://github.com/mewwts/accident
import requests
from addict import Dict
r = requests.get('http://api.zippopotam.us/us/ma/belmont')
ad = Dict(r.json())
print j.state
print j.places[1]['post code'] # only work with keys without '-', space, or starting with number
