dask.dataframe.tseries.resample.Resampler.nunique

dask.dataframe.tseries.resample.Resampler.nunique

Resampler.nunique()[source]

Return number of unique elements in the group.

This docstring was copied from pandas.core.resample.Resampler.nunique.

Some inconsistencies with the Dask version may exist.

Returns
Series

Number of unique values within each group.

Examples

For SeriesGroupby:

>>> 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

For Resampler:

>>> ser = pd.Series([1, 2, 3, 3], index=pd.DatetimeIndex(  
...                 ['2023-01-01', '2023-01-15', '2023-02-01', '2023-02-15']))
>>> ser  
2023-01-01    1
2023-01-15    2
2023-02-01    3
2023-02-15    3
dtype: int64
>>> ser.resample('MS').nunique()  
2023-01-01    2
2023-02-01    1
Freq: MS, dtype: int64