pandas.DataFrame.nunique¶

DataFrame.nunique(self, axis=0, dropna=True) → pandas.core.series.Series[source]¶

Count distinct observations over requested axis.

Return Series with number of distinct observations. 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

See also

Examples

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

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