pandas.core.groupby.SeriesGroupBy.nunique — pandas 3.0.0.dev0+2097.gcdc5b7418e documentation (original) (raw)

• API reference
• GroupBy
• pandas.core.groupby.SeriesGroupBy.nunique

SeriesGroupBy.nunique(dropna=True)[source]#

Return number of unique elements in the group.

Parameters:

dropnabool, default True

Don’t include NaN in the counts.

Returns:

Series

Number of unique values within each group.

See also

core.resample.Resampler.nunique

Method nunique for Resampler.

Examples

lst = ["a", "a", "b", "b"] ser = pd.Series([1, 2, 3, 3], index=lst) ser a 1 a 2 b 3 b 3 dtype: int64 ser.groupby(level=0).nunique() a 2 b 1 dtype: int64