Index.order(return_indexer=False, ascending=True)

Index.nunique(dropna=True)

Index.duplicated(*args, **kwargs)

Index.is_integer()

Index.base return the base object if the memory of the underlying data is shared

Index.get_values()

Index.hasnans = None

Index.set_value(arr, key, value)

Index.get_level_values(level)

Index.sortlevel(level=None, ascending=True, sort_remaining=None)