pandas.DataFrame.last — pandas 0.24.0rc1 documentation (original) (raw)
DataFrame. last(offset)[source]¶
Convenience method for subsetting final periods of time series data based on a date offset.
| Parameters: | offset : string, DateOffset, dateutil.relativedelta |
|---|---|
| Returns: | subset : same type as caller |
| Raises: | TypeError If the index is not a DatetimeIndex |
See also
Select initial periods of time series based on a date offset.
Select values at a particular time of the day.
Select values between particular times of the day.
Examples
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 calender days were returned, not the last 3 observed days in the dataset, and therefore data for 2018-04-11 was not returned.