pandas.core.groupby.SeriesGroupBy.nunique

SeriesGroupBy.nunique(self, dropna=True) [source]

Return number of unique elements in the group.

Returns:	Series Number of unique values within each group.

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https://pandas.pydata.org/pandas-docs/version/0.25.0/reference/api/pandas.core.groupby.SeriesGroupBy.nunique.html