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讓我們看看下面的數據框:蟒蛇,熊貓,使用GROUPBY來計算多指數DF意味着
from pandas import Timestamp
dic={'volume': {('E7', Timestamp('2016-11-01 00:00:00')): Decimal('1204'),
('E7', Timestamp('2016-08-16 00:00:00')): Decimal('1070'),
('G6', Timestamp('2016-08-17 00:00:00')): Decimal('1702'),
('G6', Timestamp('2016-08-18 00:00:00')): Decimal('1262'),
('G6', Timestamp('2016-08-26 00:00:00')): Decimal('3333'),
('VG', Timestamp('2016-08-31 00:00:00')): Decimal('1123'),
('VG', Timestamp('2016-09-01 00:00:00')): Decimal('1581'),
('VG', Timestamp('2016-09-02 00:00:00')): Decimal('1276'),
('VG', Timestamp('2016-09-06 00:00:00')): Decimal('2417'),
}}
df=pd.DataFrame(dic)
我想每個符號(第一列)來計算平均的「音量」列。
我試過df.groupby(level=0).mean()
但它沒有工作。