pandas.core.groupby.DataFrameGroupBy.agg

DataFrameGroupBy.agg(arg, *args, **kwargs) [source]

Aggregate using one or more operations over the specified axis.

Parameters:

func : function, string, dictionary, or list of string/functions Function to use for aggregating the data. If a function, must either work when passed a DataFrame or when passed to DataFrame.apply. For a DataFrame, can pass a dict, if the keys are DataFrame column names. Accepted combinations are: string function name. function. list of functions. dict of column names -> functions (or list of functions). *args Positional arguments to pass to func. **kwargs Keyword arguments to pass to func.

Returns:

aggregated : DataFrame

See also

pandas.DataFrame.groupby.apply, pandas.DataFrame.groupby.transform, pandas.DataFrame.aggregate

Notes

agg is an alias for aggregate. Use the alias.

A passed user-defined-function will be passed a Series for evaluation.

Examples

>>> df = pd.DataFrame({'A': [1, 1, 2, 2],
...                    'B': [1, 2, 3, 4],
...                    'C': np.random.randn(4)})

>>> df
   A  B         C
0  1  1  0.362838
1  1  2  0.227877
2  2  3  1.267767
3  2  4 -0.562860

The aggregation is for each column.

>>> df.groupby('A').agg('min')
   B         C
A
1  1  0.227877
2  3 -0.562860

Multiple aggregations

>>> df.groupby('A').agg(['min', 'max'])
    B             C
  min max       min       max
A
1   1   2  0.227877  0.362838
2   3   4 -0.562860  1.267767

Select a column for aggregation

>>> df.groupby('A').B.agg(['min', 'max'])
   min  max
A
1    1    2
2    3    4

Different aggregations per column

>>> df.groupby('A').agg({'B': ['min', 'max'], 'C': 'sum'})
    B             C
  min max       sum
A
1   1   2  0.590716
2   3   4  0.704907