Class FFill

dask/dataframe/dask_expr/_expr.py:3405–3435

class FFill(MapOverlap):
    _parameters = ["frame", "limit"]
    _defaults = {"limit": None}
    func = M.ffill
    enforce_metadata = True
    transform_divisions = False
    clear_divisions = False
    align_dataframes = True

    def _divisions(self):
        return self.frame.divisions

    @functools.cached_property
    def _meta(self):
        return self.frame._meta

    def _simplify_up(self, parent, dependents):
        if isinstance(parent, Projection):
            return plain_column_projection(self, parent, dependents)

    @functools.cached_property
    def kwargs(self):
        return dict(limit=self.limit)

    @property
    def before(self):
        return 1 if self.limit is None else self.limit

    @property
    def after(self):
        return 0


class BFill(FFill):