pandas.DataFrame.nunique

DataFrame.nunique(axis=0, dropna=True)

Return Series with number of distinct observations over requested axis.

New in version 0.20.0.

Parameters:

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

dropna : boolean, default True

Don’t include NaN in the counts.

Returns:

nunique : Series

Examples

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

>>> df.nunique(axis=1)
0    1
1    2
2    2