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Copy file name to clipboardExpand all lines: doc/source/whatsnew/v2.3.1.rst
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.. _whatsnew_231:
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What's new in 2.3.1 (Month XX, 2025)
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What's new in 2.3.1 (July 7, 2025)
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------------------------------------
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These are the changes in pandas 2.3.1. See :ref:`release` for a full changelog
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Improvements and fixes for the StringDtype
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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Most changes in this release are related to :class:`StringDtype` which will
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become the default string dtype in pandas 3.0. See
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:ref:`whatsnew_230.upcoming_changes` for more details.
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.. _whatsnew_231.string_fixes.string_comparisons:
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Comparisons between different string dtypes
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^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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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
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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
- Bug in :meth:`DataFrame.join` incorrectly downcasting object-dtype indexes (:issue:`61771`)
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- 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`)
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- Fixed bug in :meth:`DataFrame.explode` and :meth:`Series.explode` where methods would fail with ``dtype="str"`` (:issue:`61623`)
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- Fixed bug in unpickling objects pickled in pandas versions pre-2.3.0 that used :class:`StringDtype` (:issue:`61763`).
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.. _whatsnew_231.regressions:
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- Fixed bug in unpickling objects pickled in pandas versions pre-2.3.0 that used :class:`StringDtype` (:issue:`61763`)
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