Allow Keyword aggregation in SeriesGroupBy · Issue #26512 · pandas-dev/pandas (original) (raw)

In [1]: df = pd.DataFrame({'A': [1, 1, 1, 2, 2], ...: 'B': range(5), ...: 'C': range(5)})

In [2]: df
Out[2]: A B C 0 1 0 0 1 1 1 1 2 1 2 2 3 2 3 3 4 2 4 4

In [3]: df.groupby('A').B.agg(foo='count')
Out[3]: foo A
1 3 2 2