如何从嵌套列中提取 json 到数据框 [英] How to extract json from nested column to dataframe
本文介绍了如何从嵌套列中提取 json 到数据框的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我正在从 TD Ameritrade API 提取股票数据，我想将其存储在 DataFrame 中.
I'm pulling stock data from TD Ameritrade API and I want to store it in a DataFrame.
从 API 中我得到一个嵌套的 JSON 对象，当我将它放入数据框中时，我得到 4 列:索引、蜡烛、空、符号.但是，蜡烛内部是一个字典，我希望将其作为数据框中的单独列(打开"、关闭"、...)
From the API I get a nested JSON object and when I put it in a data frame I get 4 columns: Index, Candles, Empty, Symbol. However inside of candles is a dictionary that I want as separate columns in the dataframe ('open','close',...)
我试过 json_normalize和 pd.io.json.json_normalize
都没有给我想要的结果
import pandas as pd
import requests
from pandas.io.json import json_normalize
endpoint = r'https://api.tdameritrade.com/v1/marketdata/{}/pricehistory'.format('GOOG')
client_id = 'AMSAFI1234567'
payload = {'apikey':client_id,
'periodType': 'day',
'frequencyType': 'minute',
'frequency' :'1',
'period':'2',
'endDate': '1556158524000',
'startDate': '1554535854000',
'needExtendedHoursData':'true'}
content = requests.get(url = endpoint, params = payload)
data = content.json()
print(data)
输出:
{'candles': [{'open': 1260.25, 'high': 1260.5, 'low': 1260.0, 'close': 1260.28,
'volume': 2544, 'datetime': 1556029980000}, {'open': 1260.39, 'high': 1260.61,
'low': 1260.3501, 'close': 1260.3501, 'volume': 1703, 'datetime':
1556030040000}, {'open': 1260.35, 'high': 1260.59, 'low': 1260.07, 'close':
1260.56, 'volume': 2156, 'datetime': 1556030100000}, {'open': 1260.56, 'high':
1260.56, 'low': 1259.27, 'close': 1259.7, 'volume': 1320, 'datetime':
1556030160000}, {'open': 1260.06, 'high': 1260.06, 'low': 1259.56, 'close':
1259.56, 'volume': 800, 'datetime': 1556030220000},
....
'close': 1264.61, 'volume': 100, 'datetime': 1556146920000}, {'open': 1265.87,
'high': 1266.0, 'low': 1265.87, 'close': 1266.0, 'volume': 232, 'datetime':
1556147220000}], 'symbol': 'GOOG', 'empty': False}
输入:
pd.DataFrame(data)
pd.DataFrame(data)
输出:
具有 4 列(索引"、蜡烛"、空"、符号")的数据框.Candles 列是一本字典.我试图将字典中的所有键作为列，将键值作为数据帧中的行
Data frame with 4 columns ('Index', 'Candles', 'Empty', 'Symbol'). The Candles column is a dictionary. I'm trying to get all the keys in the dictionaries as columns and the key values as rows in the dataframe
推荐答案
您使用的 json_normalize 1 级别太高.您想要标准化/展平 data['candles'] 下的数据:
You're using json_normalize 1 level too high. You're wanting to normalize/flatten out the data under data['candles']:
我也会小心发布 api 密钥.
I'd also be careful about posting api keys.
import pandas as pd
import requests
from pandas.io.json import json_normalize
endpoint = r'https://api.tdameritrade.com/v1/marketdata/{}/pricehistory'.format('GOOG')
client_id = 'XXXXXXXXXXX'
payload = {'apikey':client_id,
'periodType': 'day',
'frequencyType': 'minute',
'frequency' :'1',
'period':'2',
'endDate': '1556158524000',
'startDate': '1554535854000',
'needExtendedHoursData':'true'}
content = requests.get(url = endpoint, params = payload)
data = content.json()
df = json_normalize(data['candles'])
输出:
print (df)
close datetime high low open volume
0 1267.0000 1556035860000 1267.8600 1267.0000 1267.8600 1450
1 1266.8500 1556035920000 1266.8500 1266.8500 1266.8500 100
2 1266.5300 1556035980000 1266.7300 1266.2400 1266.6750 1290
3 1267.1613 1556036040000 1267.1613 1266.5400 1266.5500 1190
4 1267.4150 1556036100000 1267.4150 1266.8800 1266.8800 1100
5 1267.4299 1556036160000 1267.4299 1267.4299 1267.4299 250
6 1267.4540 1556036220000 1268.1800 1267.4540 1267.8100 1650
7 1267.0800 1556036280000 1267.5100 1267.0800 1267.4900 900
8 1265.6850 1556036340000 1267.1210 1265.5300 1267.1210 4148
9 1265.4600 1556036400000 1265.9600 1265.1703 1265.8300 2290
10 1266.2774 1556036460000 1266.4800 1265.4050 1265.4050 3341
11 1266.4684 1556036520000 1266.4684 1266.3247 1266.3247 1134
12 1266.8550 1556036580000 1267.0500 1266.4600 1266.4600 1500
13 1267.2550 1556036640000 1267.3500 1266.6401 1267.0393 1619
14 1267.2400 1556036700000 1267.2450 1267.2400 1267.2450 230
15 1266.8000 1556036760000 1267.4400 1266.8000 1267.4400 940
16 1266.0992 1556036820000 1266.5270 1266.0992 1266.5270 1523
17 1266.2599 1556036880000 1266.2700 1266.2599 1266.2700 600
18 1265.8400 1556036940000 1266.2350 1265.6800 1265.8400 2165
19 1265.5400 1556037000000 1265.8600 1265.5000 1265.5300 1400
20 1265.9650 1556037060000 1265.9900 1265.1200 1265.4532 1550
21 1265.6300 1556037120000 1265.7750 1265.4300 1265.5929 1580
22 1265.4469 1556037180000 1265.5300 1265.1000 1265.5300 1071
23 1265.6600 1556037240000 1265.7100 1265.6313 1265.7100 650
24 1266.1850 1556037300000 1266.1950 1265.6257 1265.6257 930
25 1266.1400 1556037360000 1266.2500 1265.9400 1266.1300 1050
26 1266.4250 1556037420000 1266.5750 1266.3000 1266.3294 1130
27 1266.4800 1556037480000 1266.6500 1266.3500 1266.6500 900
28 1266.7400 1556037540000 1266.8300 1266.5700 1266.7100 1103
29 1266.8450 1556037600000 1266.8600 1266.8100 1266.8600 600
.. ... ... ... ... ... ...
585 1256.0000 1556136000000 1256.0000 1256.0000 1256.0000 211625
586 1258.0000 1556136360000 1258.0000 1256.0000 1256.0000 1154
587 1260.7100 1556136420000 1260.7100 1260.0000 1260.0000 550
588 1262.9500 1556136540000 1262.9500 1262.9500 1262.9500 100
589 1265.2600 1556136600000 1265.2600 1262.9500 1262.9500 2103
590 1264.5000 1556136660000 1264.5000 1263.9700 1263.9700 486
591 1264.0000 1556136840000 1264.0000 1264.0000 1264.0000 100
592 1265.6100 1556136900000 1265.6100 1265.5000 1265.5000 300
593 1264.0600 1556136960000 1264.0600 1264.0600 1264.0600 100
594 1265.1800 1556137020000 1265.1800 1265.1800 1265.1800 100
595 1264.0000 1556137140000 1264.0000 1264.0000 1264.0000 192
596 1264.9000 1556137320000 1265.1400 1264.9000 1264.9000 537
597 1264.6500 1556137620000 1264.6500 1264.6500 1264.6500 500
598 1264.7500 1556137680000 1264.7500 1264.7500 1264.7500 243
599 1266.4900 1556137740000 1266.4900 1266.4900 1266.4900 124
600 1268.0000 1556138580000 1268.0000 1268.0000 1268.0000 100
601 1267.2900 1556138700000 1267.2900 1267.2900 1267.2900 100
602 1268.9800 1556138820000 1268.9800 1268.9800 1268.9800 100
603 1269.0700 1556139240000 1269.1200 1269.0700 1269.1200 200
604 1256.0000 1556139420000 1256.0000 1256.0000 1256.0000 118
605 1269.0900 1556139480000 1269.0900 1269.0900 1269.0900 100
606 1270.0000 1556139540000 1270.0000 1270.0000 1270.0000 200
607 1267.3800 1556141040000 1267.3800 1267.3800 1267.3800 100
608 1268.0000 1556141100000 1268.0000 1268.0000 1268.0000 150
609 1268.6600 1556141940000 1268.6600 1268.6600 1268.6600 100
610 1265.0000 1556143620000 1265.0000 1265.0000 1265.0000 200
611 1265.0000 1556143740000 1265.0000 1265.0000 1265.0000 100
612 1256.0000 1556146620000 1256.0000 1256.0000 1256.0000 136
613 1264.6100 1556146920000 1264.6100 1264.6100 1264.6100 100
614 1266.0000 1556147220000 1266.0000 1265.8700 1265.8700 232
[615 rows x 6 columns]
这篇关于如何从嵌套列中提取 json 到数据框的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
查看全文
