pandas.Index.rename

Index.rename(name, *, inplace=False)[source]

Alter Index or MultiIndex name.

Able to set new names without level. Defaults to returning new index. Length of names must match number of levels in MultiIndex.

Parameters:

name:label or list of labels

Name(s) to set.

inplace:bool, default False

Modifies the object directly, instead of creating a new Index or MultiIndex.

Returns:

Index or None

The same type as the caller or None if inplace=True.

See also

Index.set_names

Able to set new names partially and by level.

Examples

>>> idx = pd.Index(['A', 'C', 'A', 'B'], name='score')
>>> idx.rename('grade')
Index(['A', 'C', 'A', 'B'], dtype='object', name='grade')

>>> idx = pd.MultiIndex.from_product([['python', 'cobra'],
...                                   [2018, 2019]],
...                                   names=['kind', 'year'])
>>> idx
MultiIndex([('python', 2018),
            ('python', 2019),
            ( 'cobra', 2018),
            ( 'cobra', 2019)],
           names=['kind', 'year'])
>>> idx.rename(['species', 'year'])
MultiIndex([('python', 2018),
            ('python', 2019),
            ( 'cobra', 2018),
            ( 'cobra', 2019)],
           names=['species', 'year'])
>>> idx.rename('species')
Traceback (most recent call last):
TypeError: Must pass list-like as `names`.