pandas.DataFrame.nunique — pandas 0.25.3 documentation (original) (raw)

Count distinct observations over requested axis.

Return Series with number of distinct observations. Can ignore NaN values.

New in version 0.20.0.

df = pd.DataFrame({'A': [1, 2, 3], 'B': [1, 1, 1]}) df.nunique() A 3 B 1 dtype: int64