pandas.core.groupby.SeriesGroupBy.take#

SeriesGroupBy.take(indices, axis=0, **kwargs)[source]#

Return the elements in the given positional indices in each group.

This means that we are not indexing according to actual values in the index attribute of the object. We are indexing according to the actual position of the element in the object.

If a requested index does not exist for some group, this method will raise. To get similar behavior that ignores indices that don’t exist, see SeriesGroupBy.nth().

Parameters

indicesarray-like: An array of ints indicating which positions to take in each group.
axis{0 or ‘index’, 1 or ‘columns’, None}, default 0: The axis on which to select elements. 0 means that we are selecting rows, 1 means that we are selecting columns. For SeriesGroupBy this parameter is unused and defaults to 0.
**kwargs: For compatibility with numpy.take(). Has no effect on the output.

Returns

Series: A Series containing the elements taken from each group.

See also

Series.take: Take elements from a Series along an axis.
Series.loc: Select a subset of a DataFrame by labels.
Series.iloc: Select a subset of a DataFrame by positions.
numpy.take: Take elements from an array along an axis.
SeriesGroupBy.nth: Similar to take, won’t raise if indices don’t exist.

Examples

>>> df = pd.DataFrame([('falcon', 'bird', 389.0),
...                    ('parrot', 'bird', 24.0),
...                    ('lion', 'mammal', 80.5),
...                    ('monkey', 'mammal', np.nan),
...                    ('rabbit', 'mammal', 15.0)],
...                   columns=['name', 'class', 'max_speed'],
...                   index=[4, 3, 2, 1, 0])
>>> df
     name   class  max_speed
4  falcon    bird      389.0
3  parrot    bird       24.0
2    lion  mammal       80.5
1  monkey  mammal        NaN
0  rabbit  mammal       15.0
>>> gb = df["name"].groupby([1, 1, 2, 2, 2])

Take elements at positions 0 and 1 along the axis 0 in each group (default).

>>> gb.take([0, 1])
1  4    falcon
   3    parrot
2  2      lion
   1    monkey
Name: name, dtype: object

We may take elements using negative integers for positive indices, starting from the end of the object, just like with Python lists.

>>> gb.take([-1, -2])
1  3    parrot
   4    falcon
2  0    rabbit
   1    monkey
Name: name, dtype: object