pandas.Index.map

Index. map ( mapper, na_action=None ) [source]

Map values using an input mapping or function.

Parameters

mapper :function, dict, or Series

Mapping correspondence.

na_action :{None, ‘ignore’}

If ‘ignore’, propagate NA values, without passing them to the mapping correspondence.

Returns

applied :Union[Index, MultiIndex], inferred

The output of the mapping function applied to the index. If the function returns a tuple with more than one element a MultiIndex will be returned.