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11 changes: 6 additions & 5 deletions doc/source/groupby.rst
Original file line number Diff line number Diff line change
Expand Up @@ -257,20 +257,21 @@ GroupBy with MultiIndex
With :ref:`hierarchically-indexed data <advanced.hierarchical>`, it's quite
natural to group by one of the levels of the hierarchy.

Let's create a series with a two-level ``MultiIndex``.

.. ipython:: python
:suppress:


arrays = [['bar', 'bar', 'baz', 'baz', 'foo', 'foo', 'qux', 'qux'],
['one', 'two', 'one', 'two', 'one', 'two', 'one', 'two']]
tuples = list(zip(*arrays))
tuples
index = pd.MultiIndex.from_tuples(tuples, names=['first', 'second'])
index = pd.MultiIndex.from_arrays(arrays, names=['first', 'second'])
s = pd.Series(np.random.randn(8), index=index)
s

We can then group by one of the levels in ``s``.

.. ipython:: python

s
grouped = s.groupby(level=0)
grouped.sum()

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