pandas.Index.map#

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

Map values using an input mapping or function.

Parameters:

mapperfunction, dict, or Series

Mapping correspondence.

na_action{None, ‘ignore’}

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

Returns:

Union[Index, MultiIndex]

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

Examples

>>>idx=pd.Index([1,2,3])>>>idx.map({1:'a',2:'b',3:'c'})Index(['a', 'b', 'c'], dtype='object')

Usingmap with a function:

>>>idx=pd.Index([1,2,3])>>>idx.map('I am a{}'.format)Index(['I am a 1', 'I am a 2', 'I am a 3'], dtype='object')

>>>idx=pd.Index(['a','b','c'])>>>idx.map(lambdax:x.upper())Index(['A', 'B', 'C'], dtype='object')