Series.dt.
is_quarter_start
Indicator for whether the date is the first day of a quarter.
is_quarter_start – The same type as the original data with boolean values. Series will have the same name and index. DatetimeIndex will have the same name.
Series or DatetimeIndex
参见
quarter
Return the quarter of the date.
is_quarter_end
Similar property for indicating the quarter start.
实际案例
This method is available on Series with datetime values under the .dt accessor, and directly on DatetimeIndex.
.dt
>>> import mars.dataframe as md >>> df = md.DataFrame({'dates': md.date_range("2017-03-30", ... periods=4)}) >>> df.assign(quarter=df.dates.dt.quarter, ... is_quarter_start=df.dates.dt.is_quarter_start).execute() dates quarter is_quarter_start 0 2017-03-30 1 False 1 2017-03-31 1 False 2 2017-04-01 2 True 3 2017-04-02 2 False
>>> idx = md.date_range('2017-03-30', periods=4) >>> idx.execute() DatetimeIndex(['2017-03-30', '2017-03-31', '2017-04-01', '2017-04-02'], dtype='datetime64[ns]', freq='D')
>>> idx.is_quarter_start.execute() array([False, False, True, False])