pandas.DataFrame.last#

DataFrame.last(offset)[source] #

Select final periods of time series data based on a date offset.

Deprecated since version 2.1: 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.

Parameters:

offsetstr, 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.

Returns:

Series or DataFrame

A subset of the caller.

Raises:

TypeError

If the index is not a DatetimeIndex

See also

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.

Notes

Deprecated since version 2.1.0: Please create a mask and filter using .loc instead

Examples

>>> i = pd.date_range('2018年04月09日', periods=4, freq='2D')
>>> ts = pd.DataFrame({'A': [1, 2, 3, 4]}, index=i)
>>> ts
 A
2018年04月09日 1
2018年04月11日 2
2018年04月13日 3
2018年04月15日 4

Get the rows for the last 3 days:

>>> ts.last('3D') 
 A
2018年04月13日 3
2018年04月15日 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年04月11日 was not returned.