pandas.Panel.first¶
-
Panel.
first
(offset)[source]¶ Convenience method for subsetting initial periods of time series data based on a date offset.
Parameters: - offset : string, DateOffset, dateutil.relativedelta
Returns: - subset : type of caller
Raises: TypeError
If the index is not a
DatetimeIndex
See also
last
- Select final 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
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 first 3 days:
>>> ts.first('3D') A 2018-04-09 1 2018-04-11 2
Notice the data for 3 first calender days were returned, not the first 3 days observed in the dataset, and therefore data for 2018-04-13 was not returned.