Python Pandas - 创建 PeriodIndex 并获取月份中的天数
要创建 PeriodIndex,使用 pandas.PeriodIndex() 方法。使用 PeriodIndex.daysinmonth 属性获取月份的天数
首先,导入所需的库 −
import pandas as pd
创建 PeriodIndex 对象。PeriodIndex 是一种不可变的 ndarray,其中包含指示时间中的规则周期的数据。已通过使用“freq”参数设置频率 −
periodIndex = pd.PeriodIndex(['2018-07-25', '2019-10-30', '2020-11-20', '2021-09-15', '2022-03-12', '2023-06-18'], freq="D")
显示 PeriodIndex 对象 −
print("PeriodIndex...\n", periodIndex)
从 PeriodIndex 对象中显示特定月份的天数 −
print("\nDays of the specific month from the PeriodIndex...\n", periodIndex.daysinmonth)范例
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(['2018-07-25', '2019-10-30', '2020-11-20',
'2021-09-15', '2022-03-12', '2023-06-18'], freq="D")
# Display PeriodIndex object
print("PeriodIndex...\n", periodIndex)
# Display PeriodIndex frequency
print("\nPeriodIndex frequency...\n", periodIndex.freq)
# Display the month number i.e. 1 = January, 2 = February ... 12 = December
print("\nMonth number...\n", periodIndex.month)
# Display days in the specific month from the PeriodIndex object
print("\nDays of the specific month from the PeriodIndex...\n", periodIndex.daysinmonth)输出
这会产生以下代码 −
PeriodIndex... PeriodIndex(['2018-07-25', '2019-10-30', '2020-11-20', '2021-09-15', '2022-03-12', '2023-06-18'], dtype='period[D]') PeriodIndex frequency... <Day> Month number... Int64Index([7, 10, 11, 9, 3, 6], dtype='int64') Days of the specific month from the PeriodIndex... Int64Index([31, 31, 30, 30, 31, 30], dtype='int64')
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