CategoricalIndex.identical(other)

DatetimeIndex.has_duplicates

DatetimeIndex.unique()

DataFrameGroupBy.resample(rule, *args, **kwargs)

Index.T return the transpose, which is by definition self

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

CategoricalIndex.codes

Index.is_(other)

DataFrame.bool()

DatetimeIndex.is_monotonic_decreasing return if the index is monotonic decreasing (only equal