DatetimeIndex.is_numeric()

Index.is_lexsorted_for_tuple(tup)

DataFrame.to_pickle(path)

Panel4D.to_xarray()

TimedeltaIndex.where(cond, other=None)

DataFrame.ffill(axis=None, inplace=False, limit=None, downcast=None)

Panel.axes Return index label(s) of the internal NDFrame

Series.str.zfill(width)

StataReader.variable_labels()

TimedeltaIndex.total_seconds()