pandas.Index.nunique

Index.nunique(self, dropna=True)

Return number of unique elements in the object.

Excludes NA values by default.

Parameters

dropnabool, 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

pandas.Index.notnull pandas.Index.putmask