pandas.PeriodIndex.daysinmonth # 属性 周期索引。每月天数[来源] # 该月的天数。 例子 对于系列: >>> period = pd.period_range('2020-1-1 00:00', '2020-3-1 00:00', freq='M') >>> s = pd.Series(period) >>> s 0 2020-01 1 2020-02 2 2020-03 dtype: period[M] >>> s.dt.days_in_month 0 31 1 29 2 31 dtype: int64 对于周期索引: >>> idx = pd.PeriodIndex(["2023-01", "2023-02", "2023-03"], freq="M") >>> idx.days_in_month # It can be also entered as `daysinmonth` Index([31, 28, 31], dtype='int64')