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DOC: Added example of using OrderedDict for agg. #13938

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DOC: Added example of using OrderedDict for agg. #13938

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DOC: Added example of using OrderedDict for agg.
bkandel-picwell Aug 5, 2016
8097de8
Changed to note.
bkandel-picwell Aug 8, 2016
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10 changes: 10 additions & 0 deletions doc/source/groupby.rst
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Original file line number Diff line number Diff line change
Expand Up @@ -13,6 +13,7 @@
matplotlib.style.use('ggplot')
import matplotlib.pyplot as plt
plt.close('all')
from collections import OrderedDict

*****************************
Group By: split-apply-combine
Expand Down Expand Up @@ -487,6 +488,15 @@ must be either implemented on GroupBy or available via :ref:`dispatching

grouped.agg({'C' : 'sum', 'D' : 'std'})

Note that if you pass a dict to ``aggregate``, the ordering of the output colums is
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put this in a .. note:: (you need to indent as well)

non-deterministic. If you want to be sure the output columns will be in a specific
order, you can use an ``OrderedDict``. Compare the output of the following two commands:

.. ipython:: python

grouped.agg({'D': 'std', 'C': 'mean'})
grouped.agg(OrderedDict([('D', 'std'), ('C', 'mean')]))

.. _groupby.aggregate.cython:

Cython-optimized aggregation functions
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