问题描述
我正在打印字典,得到的输出如下:
opening_range_bars = minute_bars.loc[opening_range_mask]
print(opening_range_bars)
open high low close volume
time
2021-02-16 00:00:00-05:00 51.16 51.7500 50.4850 51.04 99823
2021-02-17 00:00:00-05:00 50.73 51.3921 49.7025 50.91 149788
2021-02-18 00:00:00-05:00 50.45 51.1200 49.7650 50.69 133951
2021-02-19 00:00:00-05:00 50.64 51.4600 50.6400 51.44 133578
CMI
open high low close volume
time
2021-02-16 00:00:00-05:00 244.47 247.565 243.26 244.52 726380
2021-02-17 00:00:00-05:00 244.23 245.810 238.85 241.81 719238
2021-02-18 00:00:00-05:00 239.50 241.693 237.72 241.67 878032
2021-02-19 00:00:00-05:00 243.24 248.550 242.34 246.89 895406
当我打印时:
for key in opening_range_bars.keys():
print(opening_range_bars.keys())
我明白了:
MultiIndex([('CMI','open'),('CMI','high'),'low'),'close'),'volume')],)
MultiIndex([('CMI',
但如果我想参考“低”列:
opening_range_low = opening_range_bars['low'].min()
print(opening_range_low)
我收到密钥错误:
raise KeyError(key) from err
KeyError: 'low'
提前感谢您的帮助。
解决方法
请尝试:
opening_range_low = opening_range_bars.loc[:,[('CMI','low')]].min()