pandas.DataFrame.nunique — pandas 2.2.3 documentation (original) (raw)

DataFrame.nunique(axis=0, dropna=True)[source]#

Count number of distinct elements in specified axis.

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

Parameters:

axis{0 or ‘index’, 1 or ‘columns’}, default 0

The axis to use. 0 or ‘index’ for row-wise, 1 or ‘columns’ for column-wise.

dropnabool, default True

Don’t include NaN in the counts.

Returns:

Series

Examples

df = pd.DataFrame({'A': [4, 5, 6], 'B': [4, 1, 1]}) df.nunique() A 3 B 2 dtype: int64

df.nunique(axis=1) 0 1 1 2 2 2 dtype: int64