Python Pandas - 从 PeriodIndex 对象获取星期几
要从PeriodIndex对象获取星期几，请使用PeriodIndex.weekday属性。
首先，导入所需的库-
import pandas as pd
创建一个PeriodIndex对象。PeriodIndex是一个不可变的ndarray，其中包含指示定期时间段的序数值-
periodIndex = pd.PeriodIndex(['2021-09-25 07:30:35', '2019-10-30 04:15:45', '2021-07-15 02:55:15', '2022-06-25 09:40:55'], freq="T")
显示PeriodIndex对象-
print("PeriodIndex...\n", periodIndex)显示来自PeriodIndex对象的星期几。星期一=0，星期二=1...星期日=6的星期几-
print("\nThe day of week from the PeriodIndex object...\n", periodIndex.weekday)示例
以下是代码-
import pandas as pd
#CreateaPeriodIndexobject
#PeriodIndexisanimmutablendarrayholdingordinalvaluesindicatingregularperiodsintime
# We have set the frequency using the "freq" parameter
periodIndex = pd.PeriodIndex(['2021-09-25 07:30:35', '2019-10-30 04:15:45',
'2021-07-15 02:55:15', '2022-06-25 09:40:55'], freq="T")
#DisplayPeriodIndexobject
print("PeriodIndex...\n", periodIndex)
#DisplayPeriodIndexfrequency
print("\nPeriodIndex frequency object...\n", periodIndex.freq)
#DisplayPeriodIndexfrequency as string
print("\nPeriodIndex frequency object as a string...\n", periodIndex.freqstr)
#DisplayweekfromthePeriodIndexobject
print("\nThe week from the PeriodIndex object...\n", periodIndex.week)
#DisplaydayoftheweekfromthePeriodIndexobject
#ThedayoftheweekwithMonday=0,Tuesday=1...Sunday=6
print("\nThe day of week from the PeriodIndex object...\n", periodIndex.weekday)输出结果这将产生以下代码-
PeriodIndex... PeriodIndex(['2021-09-25 07:30', '2019-10-30 04:15', '2021-07-15 02:55', '2022-06-25 09:40'], dtype='period[T]') PeriodIndex frequency object... <Minute> PeriodIndex frequency object as a string... T The week from the PeriodIndex object... Int64Index([38, 44, 28, 25], dtype='int64') The day of week from the PeriodIndex object... Int64Index([5, 2, 3, 5], dtype='int64')