xorbits.pandas.Series.last#
- Series.last(offset) None #
Select final periods of time series data based on a date offset.
2.1(pandas) 版后已移除:
last()
is deprecated and will be removed in a future version. Please create a mask and filter using .loc instead.For a DataFrame with a sorted DatetimeIndex, this function selects the last few rows based on a date offset.
- 参数
offset (str, DateOffset, dateutil.relativedelta) – The offset length of the data that will be selected. For instance, ‘3D’ will display all the rows having their index within the last 3 days.
- 返回
A subset of the caller.
- 返回类型
- 引发
TypeError – If the index is not a
DatetimeIndex
参见
first
Select initial periods of time series based on a date offset.
at_time
Select values at a particular time of the day.
between_time
Select values between particular times of the day.
提示
2.1.0(pandas) 版后已移除: Please create a mask and filter using .loc instead
实际案例
>>> i = pd.date_range('2018-04-09', periods=4, freq='2D') >>> ts = pd.DataFrame({'A': [1, 2, 3, 4]}, index=i) >>> ts A 2018-04-09 1 2018-04-11 2 2018-04-13 3 2018-04-15 4
Get the rows for the last 3 days:
>>> ts.last('3D') A 2018-04-13 3 2018-04-15 4
Notice the data for 3 last calendar days were returned, not the last 3 observed days in the dataset, and therefore data for 2018-04-11 was not returned.
警告
This method has not been implemented yet. Xorbits will try to execute it with pandas.
This docstring was copied from pandas.core.series.Series.