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 the mapping 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 element a 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')
Using map 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(lambda x: x.upper()) Index(['A', 'B', 'C'], dtype='object')