pandas.Index.nunique

Index.nunique(self, dropna=True)

Return number of unique elements in the object.

Excludes NA values by default.

Parameters:

dropna : bool, default True

Don’t include NaN in the count.

Returns:

int

See also

DataFrame.nunique

Method nunique for DataFrame.

Series.count

Count non-NA/null observations in the Series.

Examples

>>> s = pd.Series([1, 3, 5, 7, 7])
>>> s
0    1
1    3
2    5
3    7
4    7
dtype: int64

>>> s.nunique()
4