pandas.Series.pad

Series.pad(self: ~FrameOrSeries, axis=None, inplace: bool = False, limit=None, downcast=None) → Union[~FrameOrSeries, NoneType]

Synonym for DataFrame.fillna() with method='ffill'.

Returns

{klass} or None

Object with missing values filled or None if inplace=True.

pandas.Series.nunique pandas.Series.pct_change