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DOC: add warning section in indexing docs. #13060

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DOC: add warning section in indexing docs. #13060

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Add warning section in indexing docs. Close #12947.
zhangxiangnick May 3, 2016
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Add warning section in indexing docs.
zhangxiangnick May 3, 2016
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11 changes: 11 additions & 0 deletions doc/source/indexing.rst
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Expand Up @@ -191,6 +191,17 @@ raised. Multiple columns can also be set in this manner:
You may find this useful for applying a transform (in-place) to a subset of the
columns.

.. warning::

Pandas aligns index for assigning ``DataFrame`` from ``.loc``, ``.iloc`` and ``.ix``.
For example, in the expression

.. code-block:: python

df.loc[:,['B', 'A']] = df.loc[:,['A', 'B']]

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I would show the rhs here (as well)

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What do you mean by "show here"?

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I would show df.loc[:, ['A', 'B'] (e.g. what you are assigning)

``df`` is not modified. The alignment is ignored in column assignment.
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It would maybe be good to also give an illustration of the last sentence


Attribute Access
----------------

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