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Backport PR #61794 on branch 2.3.x (DOC: prepare 2.3.1 whatsnew notes for release) #61803

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merged 1 commit into from
Jul 7, 2025
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Backport PR #61794 on branch 2.3.x (DOC: prepare 2.3.1 whatsnew notes for release) #61803

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2 changes: 1 addition & 1 deletion doc/source/whatsnew/v2.3.0.rst
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Expand Up @@ -177,4 +177,4 @@ Other
Contributors
~~~~~~~~~~~~

.. contributors:: v2.2.3..v2.3.0|HEAD
.. contributors:: v2.2.3..v2.3.0
31 changes: 9 additions & 22 deletions doc/source/whatsnew/v2.3.1.rst
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@@ -1,6 +1,6 @@
.. _whatsnew_231:

What's new in 2.3.1 (Month XX, 2025)
What's new in 2.3.1 (July 7, 2025)
------------------------------------

These are the changes in pandas 2.3.1. See :ref:`release` for a full changelog
Expand All @@ -14,12 +14,16 @@ including other versions of pandas.
Improvements and fixes for the StringDtype
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Most changes in this release are related to :class:`StringDtype` which will
become the default string dtype in pandas 3.0. See
:ref:`whatsnew_230.upcoming_changes` for more details.

.. _whatsnew_231.string_fixes.string_comparisons:

Comparisons between different string dtypes
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

In previous versions, comparing :class:`Series` of different string dtypes (e.g. ``pd.StringDtype("pyarrow", na_value=pd.NA)`` against ``pd.StringDtype("python", na_value=np.nan)``) would result in inconsistent resulting dtype or incorrectly raise. pandas will now use the hierarchy
In previous versions, comparing :class:`Series` of different string dtypes (e.g. ``pd.StringDtype("pyarrow", na_value=pd.NA)`` against ``pd.StringDtype("python", na_value=np.nan)``) would result in inconsistent resulting dtype or incorrectly raise (:issue:`60639`). pandas will now use the hierarchy

object < (python, NaN) < (pyarrow, NaN) < (python, NA) < (pyarrow, NA)

Expand Down Expand Up @@ -60,30 +64,13 @@ Bug fixes
- Bug in :meth:`DataFrame.join` incorrectly downcasting object-dtype indexes (:issue:`61771`)
- Bug in :meth:`DataFrame.sum` with ``axis=1``, :meth:`.DataFrameGroupBy.sum` or :meth:`.SeriesGroupBy.sum` with ``skipna=True``, and :meth:`.Resampler.sum` with all NA values of :class:`StringDtype` resulted in ``0`` instead of the empty string ``""`` (:issue:`60229`)
- Fixed bug in :meth:`DataFrame.explode` and :meth:`Series.explode` where methods would fail with ``dtype="str"`` (:issue:`61623`)
- Fixed bug in unpickling objects pickled in pandas versions pre-2.3.0 that used :class:`StringDtype` (:issue:`61763`).


.. _whatsnew_231.regressions:
- Fixed bug in unpickling objects pickled in pandas versions pre-2.3.0 that used :class:`StringDtype` (:issue:`61763`)

Fixed regressions
~~~~~~~~~~~~~~~~~
-

.. ---------------------------------------------------------------------------
.. _whatsnew_231.bug_fixes:

Bug fixes
~~~~~~~~~

.. ---------------------------------------------------------------------------
.. _whatsnew_231.other:

Other
~~~~~
-

.. ---------------------------------------------------------------------------
.. _whatsnew_231.contributors:

Contributors
~~~~~~~~~~~~

.. contributors:: v2.3.0..v2.3.1|HEAD
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