Python Pandas - 从 PeriodIndex 对象中获取年份
要从 PeriodIndex 对象获取年份,请使用 PeriodIndex.year 属性。
首先,导入所需的库 -
import pandas as pd
创建一个 PeriodIndex 对象。我们使用“freq”参数设置频率 -
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 PeriodIndex 频率 -
print("\nPeriodIndex frequency object...\n", periodIndex.freq)从 PeriodIndex 对象显示年份 -
print("\nThe year from the PeriodIndex object...\n", periodIndex.year)
示例
以下是代码 -
import pandas as pd
# Create a PeriodIndex object
# PeriodIndex is an immutable ndarray holding ordinal values indicating regular periods in time
# 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")
# Display PeriodIndex object
print("PeriodIndex...\n", periodIndex)
# Display PeriodIndex frequency
print("\nPeriodIndex frequency object...\n", periodIndex.freq)
# Display PeriodIndex frequency as string
print("\nPeriodIndex frequency object as a string...\n", periodIndex.freqstr)
# Display year from the PeriodIndex object
print("\nThe year from the PeriodIndex object...\n", periodIndex.year)输出
将生成以下代码 -
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 year from the PeriodIndex object... Int64Index([2021, 2019, 2021, 2022], dtype='int64')
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