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DOC: More 0.22.0 updates #19002

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Dec 30, 2017
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DOC: More 0.22.0 updates #19002

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6 changes: 6 additions & 0 deletions doc/source/whatsnew/v0.21.0.txt
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Expand Up @@ -372,6 +372,12 @@ Additionally, support has been dropped for Python 3.4 (:issue:`15251`).
Sum/Prod of all-NaN or empty Series/DataFrames is now consistently NaN
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

.. note::

The changes described here have been partially reverted. See
the :ref:`v0.22.0 Whatsnew <whatsnew_0220>` for more.


The behavior of ``sum`` and ``prod`` on all-NaN Series/DataFrames no longer depends on
whether `bottleneck <http://berkeleyanalytics.com/bottleneck>`__ is installed, and return value of ``sum`` and ``prod`` on an empty Series has changed (:issue:`9422`, :issue:`15507`).

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23 changes: 23 additions & 0 deletions doc/source/whatsnew/v0.22.0.txt
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Expand Up @@ -218,3 +218,26 @@ returns ``0``.

The default behavior of ``min_periods=None``, implying that ``min_periods``
equals the window size, is unchanged.

Compatibility
~~~~~~~~~~~~~

If you maintain a library that should work across pandas versions, it
may be easiest to exclude pandas 0.21 from your requirements. Otherwise, all your
``sum()`` calls would need to check if the ``Series`` is empty before summing.

With setuptools, in your ``setup.py`` use::

install_requires=['pandas!=0.21.*', ...]

With conda, use

.. code-block:: yaml

requirements:
run:
- pandas !=0.21.0,!=0.21.1

Note that the inconsistency in the return value for all-*NA* series is still
there for pandas 0.20.3 and earlier. Avoiding pandas 0.21 will only help with
the empty case.
5 changes: 2 additions & 3 deletions pandas/core/generic.py
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Expand Up @@ -7534,8 +7534,7 @@ def _doc_parms(cls):
----------
axis : %(axis_descr)s
skipna : boolean, default True
Exclude NA/null values. If an entire row/column is NA or empty, the result
will be NA
Exclude NA/null values when computing the result.
level : int or level name, default None
If the axis is a MultiIndex (hierarchical), count along a
particular level, collapsing into a %(name1)s
Expand Down Expand Up @@ -7669,7 +7668,7 @@ def _doc_parms(cls):
The required number of valid values to perform the operation. If fewer than
``min_count`` non-NA values are present the result will be NA.

.. versionadded :: 0.21.2
.. versionadded :: 0.22.0

Added with the default being 1. This means the sum or product
of an all-NA or empty series is ``NaN``.
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