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

Index.is_unique = None

Index.insert(loc, item)

Index.is_monotonic alias for is_monotonic_increasing (deprecated)

Index.to_datetime(dayfirst=False)

Index.argsort(*args, **kwargs)

Index.all(*args, **kwargs)

Index.is_lexsorted_for_tuple(tup)

Index.reshape(*args, **kwargs)

Index.slice_indexer(start=None, end=None, step=None, kind=None)