pandas.api.indexers.BaseIndexer#
- class pandas.api.indexers.BaseIndexer(index_array=None, window_size=0, **kwargs)[source]#
Base class for window bounds calculations.
Examples
>>> from pandas.api.indexers import BaseIndexer >>> class CustomIndexer(BaseIndexer): ... def get_window_bounds(self, num_values, min_periods, center, closed, step): ... start = np.empty(num_values, dtype=np.int64) ... end = np.empty(num_values, dtype=np.int64) ... for i in range(num_values): ... start[i] = i ... end[i] = i + self.window_size ... return start, end >>> df = pd.DataFrame({"values": range(5)}) >>> indexer = CustomIndexer(window_size=2) >>> df.rolling(indexer).sum() values 0 1.0 1 3.0 2 5.0 3 7.0 4 4.0
Methods
get_window_bounds
([num_values, min_periods, ...])Computes the bounds of a window.