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

TimedeltaIndex.all(other=None)

TimedeltaIndex.format(name=False, formatter=None, **kwargs)

DataFrame.mode(axis=0, numeric_only=False)

DatetimeIndex.union_many(others)

CategoricalIndex.str()

CategoricalIndex.tolist()

CategoricalIndex.all(other=None)

Series.dt.weekofyear The week ordinal of the year

GroupBy.groups dict {group name -> group labels}