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Updated documentation pandas alignment when setting #54240

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Jul 24, 2023
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Updated documentation pandas alignment when setting #54240

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#13950 - Updated documentation on pandas alignment when setting
raj-thapa Jul 24, 2023
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Merge branch 'main' of https://github.com/raj-thapa/pandas into Updat…
raj-thapa Jul 24, 2023
1985589
Update doc/source/user_guide/indexing.rst
raj-thapa Jul 24, 2023
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13 changes: 12 additions & 1 deletion doc/source/user_guide/indexing.rst
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Expand Up @@ -155,7 +155,7 @@ columns.

.. warning::

pandas aligns all AXES when setting ``Series`` and ``DataFrame`` from ``.loc``, and ``.iloc``.
pandas aligns all AXES when setting ``Series`` and ``DataFrame`` from ``.loc``.

This will **not** modify ``df`` because the column alignment is before value assignment.

Expand All @@ -172,6 +172,17 @@ columns.
df.loc[:, ['B', 'A']] = df[['A', 'B']].to_numpy()
df[['A', 'B']]

However, pandas does not align AXES when setting ``Series`` and ``DataFrame`` from ``.iloc``
because ``.iloc`` operates by position.

This will modify ``df`` because the column alignment is not done before value assignment.

.. ipython:: python

df[['A', 'B']]
df.iloc[:, [1, 0]] = df[['A', 'B']]
df[['A','B']]


Attribute access
----------------
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