pandas.api.indexers.FixedForwardWindowIndexer#

classpandas.api.indexers.FixedForwardWindowIndexer(index_array=None, window_size=0, **kwargs)[source] #

Creates window boundaries for fixed-length windows that include the current row.

Examples

>>> df = pd.DataFrame({'B': [0, 1, 2, np.nan, 4]})
>>> df
 B
0 0.0
1 1.0
2 2.0
3 NaN
4 4.0

>>> indexer = pd.api.indexers.FixedForwardWindowIndexer(window_size=2)
>>> df.rolling(window=indexer, min_periods=1).sum()
 B
0 1.0
1 3.0
2 2.0
3 4.0
4 4.0

Methods

get_window_bounds([num_values, min_periods, ...])

Computes the bounds of a window.