python - 遍历列表后接收列表中变量的 NaN
问题描述
我有一份构成 ETF 的股票清单。我已将代码格式化为列表并将此变量命名为assets
print(assets)
['AUD', 'CRWD', 'SPLK', 'OKTA', 'AVGO', 'CSCO', 'NET', 'ZS', 'AKAM', 'FTNT', 'BAH', 'CYBR', 'CHKP', 'BA/', 'VMW', 'PFPT', 'PANW', 'VRSN', 'FFIV', 'JNPR', 'LDOS', '4704', 'FEYE', 'QLYS', 'SAIC', 'RPD', 'HO', 'MIME', 'SAIL', 'VRNS', 'ITRI', 'AVST', 'MANT', 'TENB', '053800', 'ZIXI', 'OSPN', 'RDWR', 'ULE', 'MOBL', 'ATEN', 'TUFN', 'RBBN', 'NCC', 'KRW', 'EUR', 'JPY', 'GBP', 'USD']
我使用以下for 循环遍历列表并从 yahoo 中提取历史数据
for i in assets:
try:
df[i] = web.DataReader(i, data_source='yahoo', start=start, end=end)['Adj Close']
except RemoteDataError:
print(f'{i}')
continue
我回来了:
BA/
4704
H0
053800
KRW
JPY
暗示这些资产在雅虎财经上找不到。我理解这种情况并接受。
df['FEYE']
当我在 yahoo Finance 上寻找理论上已经找到的股票(例如)时,我得到以下信息。
0 NaN 1 NaN 2 NaN 3 NaN 4 NaN 5 NaN 6 NaN 7 NaN 8 NaN 9 NaN 10 NaN 11 NaN 12 NaN 13 NaN 14 NaN 15 NaN 16 NaN 17 NaN 18 NaN 19 NaN 20 NaN 21 NaN 22 NaN 23 NaN 24 NaN 25 NaN 26 NaN 27 NaN 28 NaN 29 NaN 30 NaN 31 NaN 32 NaN 33 NaN 34 NaN 35 NaN 36 NaN 37 NaN 38 NaN 39 NaN 40 NaN 41 NaN 42 NaN 43 NaN 44 NaN 45 NaN 46 NaN 47 NaN 48 NaN
名称:FEYE,数据类型:float64
当我只用一份正常进行时
(例如CSCO = web.DataReader(assets[5], data_source='yahoo', start=start, end=end)['Adj Close']
)
没关系。
任何帮助是极大的赞赏,
谢谢!
解决方案
这是代码和输出的可重现测试示例。如果您已命名现有数据框df
,则新数据在索引和列名方面不兼容。需要创建新的数据框,但在循环之外。每次迭代都会创建带有代码数据的新列。
import pandas as pd
import pandas_datareader.data as web
from pandas_datareader._utils import RemoteDataError
assets=['AUD', 'CRWD', 'SPLK', 'OKTA', 'AVGO', 'CSCO', 'NET', 'ZS', 'AKAM', 'FTNT', 'BAH', 'CYBR', 'CHKP', 'BA/', 'VMW', 'PFPT', 'PANW', 'VRSN', 'FFIV', 'JNPR', 'LDOS', '4704', 'FEYE', 'QLYS', 'SAIC', 'RPD', 'HO', 'MIME', 'SAIL', 'VRNS', 'ITRI', 'AVST', 'MANT', 'TENB', '053800', 'ZIXI', 'OSPN', 'RDWR', 'ULE', 'MOBL', 'ATEN', 'TUFN', 'RBBN', 'NCC', 'KRW', 'EUR', 'JPY', 'GBP', 'USD']
df = pd.DataFrame()
for i in assets:
try:
print(f'Try: {i}')
df[i] = web.DataReader(i, data_source='yahoo')['Adj Close']
except RemoteDataError as r:
print(f'Try: {i}: {r}')
continue
结果:
Try: AUD
Try: CRWD
Try: SPLK
Try: OKTA
Try: AVGO
Try: CSCO
Try: NET
Try: ZS
Try: AKAM
Try: FTNT
Try: BAH
Try: CYBR
Try: CHKP
Try: BA/
Try: BA/: Unable to read URL: https://finance.yahoo.com/quote/BA//history?period1=1435975200&period2=1593741599&interval=1d&frequency=1d&filter=history
Response Text:
b'<html>\n<meta charset=\'utf-8\'>\n<script>\nvar u=\'https://www.yahoo.com/?err=404&err_url=https%3a%2f%2ffinance.yahoo.com%2fquote%2fBA%2f%2fhistory%3fperiod1%3d1435975200%26period2%3d1593741599%26interval%3d1d%26frequency%3d1d%26filter%3dhistory\';\nif(window!=window.top){\n document.write(\'<p>Content is currently unavailable.</p><img src="//geo.yahoo.com/p?s=1197757039&t=\'+new Date().getTime()+\'&_R=\'+encodeURIComponent(document.referrer)+\'&err=404&err_url=\'+u+\'" width="0px" height="0px"/>\');\n}else{\n window.location.replace(u);\n}\n</script>\n<noscript><META http-equiv="refresh" content="0;URL=\'https://www.yahoo.com/?err=404&err_url=https%3a%2f%2ffinance.yahoo.com%2fquote%2fBA%2f%2fhistory%3fperiod1%3d1435975200%26period2%3d1593741599%26interval%3d1d%26frequency%3d1d%26filter%3dhistory\'"></noscript>\n</html>\n'
Try: VMW
Try: PFPT
Try: PANW
Try: VRSN
Try: FFIV
Try: JNPR
Try: LDOS
Try: 4704
Try: 4704: No data fetched for symbol 4704 using YahooDailyReader
Try: FEYE
Try: QLYS
Try: SAIC
Try: RPD
Try: HO
Try: HO: No data fetched for symbol HO using YahooDailyReader
Try: MIME
Try: SAIL
Try: VRNS
Try: ITRI
Try: AVST
Try: MANT
Try: TENB
Try: 053800
Try: 053800: No data fetched for symbol 053800 using YahooDailyReader
Try: ZIXI
Try: OSPN
Try: RDWR
Try: ULE
Try: MOBL
Try: ATEN
Try: TUFN
Try: RBBN
Try: NCC
Try: KRW
Try: KRW: No data fetched for symbol KRW using YahooDailyReader
Try: EUR
Try: JPY
Try: JPY: No data fetched for symbol JPY using YahooDailyReader
Try: GBP
请注意有两种类型的错误:
- 当股票不存在时,例如“HO”
- 由于“BA/”中的“/”导致生成的 URL 错误时
结果集数据框的负责人df.head()
:
AUD CRWD SPLK OKTA ... NCC EUR GBP USD
Date ...
2015-11-03 51.500000 NaN 57.139999 NaN ... 3.45 NaN 154.220001 13.608685
2015-12-22 55.189999 NaN 54.369999 NaN ... 3.48 NaN 148.279999 13.924644
2015-12-23 55.560001 NaN 56.509998 NaN ... 3.48 NaN 148.699997 14.146811
2015-12-24 55.560001 NaN 56.779999 NaN ... 3.48 NaN 149.119995 14.324224
2015-12-28 56.270000 NaN 57.660000 NaN ... 3.48 NaN 148.800003 14.057305
[5 rows x 43 columns]
希望这可以帮助。
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