Bra*_*mon 6 python timedelta python-3.x pandas
大熊猫TimedeltaIndex具有days可用于与其他普通dtypes(float64等)进行操作的属性:
import pandas as pd
from pandas.tseries import offsets
idx1 = pd.date_range('2017-01', periods=10)
idx2 = idx1 + offsets.MonthEnd(1)
tds = idx2 - idx1
print(tds.days - 2)
Int64Index([28, 27, 26, 25, 24, 23, 22, 21, 20, 19], dtype='int64')
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但是,当tds转换为Series(显式或作为DataFrame列)时,它将失去此属性。
print(pd.Series(tds).days)
---------------------------------------------------------------------------
AttributeError Traceback (most recent call last)
<ipython-input-115-cb20b4d368f4> in <module>()
----> 1 print(pd.Series(tds).days)
C:\Users\bsolomon\Anaconda3\lib\site-packages\pandas\core\generic.py in __getattr__(self, name)
3079 if name in self._info_axis:
3080 return self[name]
-> 3081 return object.__getattribute__(self, name)
3082
3083 def __setattr__(self, name, value):
AttributeError: 'Series' object has no attribute 'days'
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访问.days需要转换回Index:
print(pd.Index(pd.Series(tds)).days)
Int64Index([30, 29, 28, 27, 26, 25, 24, 23, 22, 21], dtype='int64')
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是否有比上述转换更直接的方法来访问此属性?
使用.dt访问器:
print(pd.Series(tds).dt.days)
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输出:
0 30
1 29
2 28
3 27
4 26
5 25
6 24
7 23
8 22
9 21
dtype: int64
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