dask.dataframe.groupby.SeriesGroupBy.nunique
dask.dataframe.groupby.SeriesGroupBy.nunique¶
- SeriesGroupBy.nunique(split_every=None, split_out=1)[source]¶
Return number of unique elements in the group.
This docstring was copied from pandas.core.groupby.generic.SeriesGroupBy.nunique.
Some inconsistencies with the Dask version may exist.
- Returns
- Series
Number of unique values within each group.
Examples
>>> import pandas as pd >>> import dask.dataframe as dd >>> d = {'col1': [1, 2, 3, 4], 'col2': [5, 6, 7, 8]} >>> df = pd.DataFrame(data=d) >>> ddf = dd.from_pandas(df, 2) >>> ddf.groupby(['col1']).col2.nunique().compute()