pandas.core.window.expanding.Expanding.first#
- Expanding.first(numeric_only=False)[source]#
Calculate the expanding First (left-most) element of the window.
- Parameters:
- numeric_onlybool, default False
Include only float, int, boolean columns.
Added in version 1.5.0.
- Returns:
- Series or DataFrame
Return type is the same as the original object with
np.float64dtype.
See also
GroupBy.firstSimilar method for GroupBy objects.
Expanding.lastMethod to get the last element in each window.
Examples
The example below will show an expanding calculation with a window size of three.
>>> s = pd.Series(range(5)) >>> s.expanding(3).first() 0 NaN 1 NaN 2 0.0 3 0.0 4 0.0 dtype: float64