Classe « MultiIndex »

Méthode pandas.MultiIndex.remove_unused_levels

Signature de la méthode remove_unused_levels

def remove_unused_levels(self) 

Description

remove_unused_levels.__doc__

        Create new MultiIndex from current that removes unused levels.

        Unused level(s) means levels that are not expressed in the
        labels. The resulting MultiIndex will have the same outward
        appearance, meaning the same .values and ordering. It will
        also be .equals() to the original.

        Returns
        -------
        MultiIndex

        Examples
        --------
        >>> mi = pd.MultiIndex.from_product([range(2), list('ab')])
        >>> mi
        MultiIndex([(0, 'a'),
                    (0, 'b'),
                    (1, 'a'),
                    (1, 'b')],
                   )

        >>> mi[2:]
        MultiIndex([(1, 'a'),
                    (1, 'b')],
                   )

        The 0 from the first level is not represented
        and can be removed

        >>> mi2 = mi[2:].remove_unused_levels()
        >>> mi2.levels
        FrozenList([[1], ['a', 'b']])