pandas.Index.nunique

Index.nunique(self, dropna=True)[source]

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
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