pandas.Series.index — pandas 2.2.3 documentation (original) (raw)

Series.index#

The index (axis labels) of the Series.

The index of a Series is used to label and identify each element of the underlying data. The index can be thought of as an immutable ordered set (technically a multi-set, as it may contain duplicate labels), and is used to index and align data in pandas.

Returns:

Index

The index labels of the Series.

Notes

For more information on pandas indexing, see the indexing user guide.

Examples

To create a Series with a custom index and view the index labels:

cities = ['Kolkata', 'Chicago', 'Toronto', 'Lisbon'] populations = [14.85, 2.71, 2.93, 0.51] city_series = pd.Series(populations, index=cities) city_series.index Index(['Kolkata', 'Chicago', 'Toronto', 'Lisbon'], dtype='object')

To change the index labels of an existing Series:

city_series.index = ['KOL', 'CHI', 'TOR', 'LIS'] city_series.index Index(['KOL', 'CHI', 'TOR', 'LIS'], dtype='object')