我对ckan有一些疑问:
如何:
我需要在ckan网站上注册才能查询数据?
我正在使用Pyhton 3.6.1
编辑2: 我曾尝试过以下代码:
import urllib
url = 'http://dados.cvm.gov.br/api/action/datastore_search?resource_id=92741280-58fc-446b-b436-931faaca4fb4&q=CNPJ_FUNDO:11.286.399/0001-35'
fileobj = urllib.request.urlopen(url)
print(fileobj.read())
但是,结果是这样的:
B' {"帮助&#34 ;: " http://dados.cvm.gov.br/api/3/action/help_show?name=datastore_search&#34 ;, "成功":真实,"结果":{" resource_id": " 92741280-58fc-446b-b436-931faaca4fb4"," fields":[{" type":" int4", " id":" _id"},{" type":" text"," id":&#34 ; CNPJ_FUNDO"},{" type": " timestamp"," id":" DT_COMPTC"},{" type":" numeric",&#34 ; ID&#34 ;: " VL_TOTAL"},{"输入":"数字"," id":" VL_QUOTA"},{& #34;类型&#34 ;: "数字"," id":" VL_PATRIM_LIQ"},{"类型":"数字",&#34 ; ID&#34 ;: " CAPTC_DIA"},{"输入":"数字"," id":" RESG_DIA"},{& #34;类型&#34 ;: "数字"," id":" NR_COTST"},{"类型":" int8",&#34 ; id":" _full_count"}, {"输入":" float4"," id":" rank"}]," q": " CNPJ_FUNDO:11.286.399 / 0001-35","记录":[]," _links":{" start": " / api / action / datastore_search?q = CNPJ_FUNDO%3A11.286.399%2F0001-35& resource_id = 92741280-58fc-446b-b436-931faaca4fb4"," next": " / API /动作/ datastore_search Q = CNPJ_FUNDO%3A11.286.399%2F0001-35&安培;偏移量= 100安培; RESOURCE_ID = 92741280-58fc-446B-b436-931faaca4fb4"}}}'
我需要像this image
这样的结果答案 0 :(得分:1)
- 从网络
加载CKAN数据集 醇>
您链接的网站在“API de Dados”链接中有一个Python示例:
import urllib
url = 'http://dados.cvm.gov.br/api/action/datastore_search?resource_id=92741280-58fc-446b-b436-931faaca4fb4&limit=5&q=title:jones'
fileobj = urllib.urlopen(url)
print fileobj.read()
- 将此数据集转换为pandas dataframe
醇>
像处理任何JSON数据集一样,解析它并加载到数据框中(这里没有特定的ckan):
>>> import pandas as pd
>>> import json
>>> response = json.loads(fileobj.read())
>>> pd.DataFrame(response['result']['records'])
CAPTC_DIA CNPJ_FUNDO DT_COMPTC NR_COTST RESG_DIA \
0 0.00 00.017.024/0001-53 2017-07-03T00:00:00 1 0.00
1 0.00 00.017.024/0001-53 2017-07-04T00:00:00 1 0.00
2 0.00 00.017.024/0001-53 2017-07-05T00:00:00 1 0.00
3 0.00 00.017.024/0001-53 2017-07-06T00:00:00 1 0.00
4 0.00 00.017.024/0001-53 2017-07-07T00:00:00 1 0.00
VL_PATRIM_LIQ VL_QUOTA VL_TOTAL _id
0 1111752.99 25.249352000000 1111831.24 1
1 1112087.29 25.256944400000 1112268.26 2
2 1112415.28 25.264393500000 1112716.06 3
3 1112754.06 25.272087600000 1113165.75 4
4 1113096.62 25.279867600000 1113293.06 5
我需要在ckan网站上有一个注册来查询数据吗?
您无需在链接的网站上注册,我无需注册即可检索数据。我更喜欢使用requests
库:
import requests
import pandas as pd
params = params={
'resource_id': '92741280-58fc-446b-b436-931faaca4fb4',
'limit': 5,
}
url = 'http://dados.cvm.gov.br/api/action/datastore_search'
r = requests.get(url, params=params).json()
df = pd.DataFrame(r['result']['records'])
看起来像limit
and offset
parameters probably behave like in SQL。您可能必须将列转换为数字/日期类型,这也不是ckan特有的,您可以在pandas文档中找到有关如何执行此操作的答案。
>>> df.describe()
_id
count 5.000000
mean 3.000000
std 1.581139
min 1.000000
25% 2.000000
50% 3.000000
75% 4.000000
max 5.000000
转换很容易:
>>> for col in ('CAPTC_DIA', 'NR_COTST', 'RESG_DIA', 'VL_PATRIM_LIQ', 'VL_QUOTA', 'VL_TOTAL'):
... df[col] = pd.to_numeric(df[col])
>>> df['DT_COMPTC'] = pd.to_datetime(df['DT_COMPTC'])
>>> df.describe()
CAPTC_DIA NR_COTST RESG_DIA VL_PATRIM_LIQ VL_QUOTA VL_TOTAL \
count 5.0 5.0 5.0 5.000000e+00 5.000000 5.000000e+00
mean 0.0 1.0 0.0 1.112421e+06 25.264529 1.112655e+06
std 0.0 0.0 0.0 5.303356e+02 0.012045 6.123444e+02
min 0.0 1.0 0.0 1.111753e+06 25.249352 1.111831e+06
25% 0.0 1.0 0.0 1.112087e+06 25.256944 1.112268e+06
50% 0.0 1.0 0.0 1.112415e+06 25.264394 1.112716e+06
75% 0.0 1.0 0.0 1.112754e+06 25.272088 1.113166e+06
max 0.0 1.0 0.0 1.113097e+06 25.279868 1.113293e+06
_id
count 5.000000
mean 3.000000
std 1.581139
min 1.000000
25% 2.000000
50% 3.000000
75% 4.000000
max 5.000000