Python Pandas - 从 PeriodIndex 对象以字符串形式返回频率对象
若要从PeriodIndex对象以字符串形式返回频率对象，请使用PeriodIndex.freqstr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 07:50:35', '2019-10-30 04:35:45', '2021-07-15 02:25:15', '2022-06-25 07:20:55'], freq="T")
显示PeriodIndex对象-
print("PeriodIndex...\n", periodIndex)将PeriodIndex频率显示为字符串-
print("\nPeriodIndex frequency object as a string...\n", periodIndex.freqstr)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 07:50:35', '2019-10-30 04:35:45',
'2021-07-15 02:25:15', '2022-06-25 07:20:55'], 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)输出结果这将产生以下代码-
PeriodIndex... PeriodIndex(['2021-09-25 07:50', '2019-10-30 04:35', '2021-07-15 02:25', '2022-06-25 07:20'], dtype='period[T]') PeriodIndex frequency object... <Minute> PeriodIndex frequency object as a string... T