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Backport PR #61560: DOC: Set date for v2.3.0.rst whatsnew #61561

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148 changes: 34 additions & 114 deletions doc/source/whatsnew/v2.3.0.rst
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Original file line number Diff line number Diff line change
@@ -1,6 +1,6 @@
.. _whatsnew_230:

What's new in 2.3.0 (Month XX, 2024)
What's new in 2.3.0 (June 4, 2025)
------------------------------------

These are the changes in pandas 2.3.0. See :ref:`release` for a full changelog
Expand All @@ -10,38 +10,25 @@ including other versions of pandas.

.. ---------------------------------------------------------------------------

.. _whatsnew_230.upcoming_changes:

Upcoming changes in pandas 3.0
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~


.. _whatsnew_230.enhancements:

Enhancements
~~~~~~~~~~~~

.. _whatsnew_230.enhancements.enhancement1:

enhancement1
^^^^^^^^^^^^


.. _whatsnew_230.enhancements.other:

Other enhancements
^^^^^^^^^^^^^^^^^^

- The semantics for the ``copy`` keyword in ``__array__`` methods (i.e. called
when using ``np.array()`` or ``np.asarray()`` on pandas objects) has been
updated to raise FutureWarning with NumPy >= 2 (:issue:`60340`)
- :meth:`Series.str.decode` result now has ``StringDtype`` when ``future.infer_string`` is True (:issue:`60709`)
- :meth:`pandas.api.interchange.from_dataframe` now uses the `PyCapsule Interface <https://arrow.apache.org/docs/format/CDataInterface/PyCapsuleInterface.html>`_ if available, only falling back to the Dataframe Interchange Protocol if that fails (:issue:`60739`)
- :meth:`~Series.to_hdf` and :meth:`~DataFrame.to_hdf` now round-trip with ``StringDtype`` (:issue:`60663`)
updated to work correctly with NumPy >= 2 (:issue:`57739`)
- :meth:`Series.str.decode` result now has :class:`StringDtype` when ``future.infer_string`` is True (:issue:`60709`)
- :meth:`~Series.to_hdf` and :meth:`~DataFrame.to_hdf` now round-trip with :class:`StringDtype` (:issue:`60663`)
- Improved ``repr`` of :class:`.NumpyExtensionArray` to account for NEP51 (:issue:`61085`)
- The :meth:`Series.str.decode` has gained the argument ``dtype`` to control the dtype of the result (:issue:`60940`)
- The :meth:`~Series.cumsum`, :meth:`~Series.cummin`, and :meth:`~Series.cummax` reductions are now implemented for ``StringDtype`` columns (:issue:`60633`)
- The :meth:`~Series.sum` reduction is now implemented for ``StringDtype`` columns (:issue:`59853`)
- The :meth:`~Series.cumsum`, :meth:`~Series.cummin`, and :meth:`~Series.cummax` reductions are now implemented for :class:`StringDtype` columns (:issue:`60633`)
- The :meth:`~Series.sum` reduction is now implemented for :class:`StringDtype` columns (:issue:`59853`)

.. ---------------------------------------------------------------------------
.. _whatsnew_230.notable_bug_fixes:
Expand All @@ -56,11 +43,26 @@ These are bug fixes that might have notable behavior changes.
notable_bug_fix1
^^^^^^^^^^^^^^^^

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

Increased minimum version for Python
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

pandas 2.3.0 supports Python 3.10 and higher.
in determining the result dtype when there are different string dtypes compared. Some examples:

- When ``pd.StringDtype("pyarrow", na_value=pd.NA)`` is compared against any other string dtype, the result will always be ``boolean[pyarrow]``.
- When ``pd.StringDtype("python", na_value=pd.NA)`` is compared against ``pd.StringDtype("pyarrow", na_value=np.nan)``, the result will be ``boolean``, the NumPy-backed nullable extension array.
- When ``pd.StringDtype("python", na_value=pd.NA)`` is compared against ``pd.StringDtype("python", na_value=np.nan)``, the result will be ``boolean``, the NumPy-backed nullable extension array.

.. _whatsnew_230.api_changes:

API changes
~~~~~~~~~~~

- When enabling the ``future.infer_string`` option, :class:`Index` set operations (like
union or intersection) will now ignore the dtype of an empty :class:`RangeIndex` or
empty :class:`Index` with ``object`` dtype when determining the dtype of the resulting
Index (:issue:`60797`)

.. ---------------------------------------------------------------------------
.. _whatsnew_230.deprecations:
Expand All @@ -71,119 +73,35 @@ Deprecations
- Deprecated the ``"pyarrow_numpy"`` storage option for :class:`StringDtype` (:issue:`60152`)
- The deprecation of setting the argument ``include_groups`` to ``True`` in :meth:`DataFrameGroupBy.apply` has been promoted from a ``DeprecationWarning`` to ``FutureWarning``; only ``False`` will be allowed (:issue:`7155`)

.. ---------------------------------------------------------------------------
.. _whatsnew_230.performance:

Performance improvements
~~~~~~~~~~~~~~~~~~~~~~~~
-
-

.. ---------------------------------------------------------------------------
.. _whatsnew_230.bug_fixes:

Bug fixes
~~~~~~~~~

Categorical
^^^^^^^^^^^
-
-

Datetimelike
^^^^^^^^^^^^
-
-

Timedelta
^^^^^^^^^
-
-

Timezones
^^^^^^^^^
-
-

Numeric
^^^^^^^
- Enabled :class:`Series.mode` and :class:`DataFrame.mode` with ``dropna=False`` to sort the result for all dtypes in the presence of NA values; previously only certain dtypes would sort (:issue:`60702`)
- Bug in :meth:`Series.round` on object columns no longer raises ``TypeError``
-

Conversion
^^^^^^^^^^
-
-
- Bug in :meth:`Series.mode` and :meth:`DataFrame.mode` with ``dropna=False`` where not all dtypes would sort in the presence of ``NA`` values (:issue:`60702`)
- Bug in :meth:`Series.round` where a ``TypeError`` would always raise with ``object`` dtype (:issue:`61206`)

Strings
^^^^^^^
- Bug in :meth:`Series.__pos__` and :meth:`DataFrame.__pos__` did not raise for :class:`StringDtype` with ``storage="pyarrow"`` (:issue:`60710`)
- Bug in :meth:`Series.rank` for :class:`StringDtype` with ``storage="pyarrow"`` incorrectly returning integer results in case of ``method="average"`` and raising an error if it would truncate results (:issue:`59768`)
- Bug in :meth:`.DataFrameGroupBy.min`, :meth:`.DataFrameGroupBy.max`, :meth:`.Resampler.min`, :meth:`.Resampler.max` where all NA values of string dtype would return float instead of string dtype (:issue:`60810`)
- 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`)
- Bug in :meth:`Series.__pos__` and :meth:`DataFrame.__pos__` where an ``Exception`` was not raised for :class:`StringDtype` with ``storage="pyarrow"`` (:issue:`60710`)
- Bug in :meth:`Series.rank` for :class:`StringDtype` with ``storage="pyarrow"`` that incorrectly returned integer results with ``method="average"`` and raised an error if it would truncate results (:issue:`59768`)
- Bug in :meth:`Series.replace` with :class:`StringDtype` when replacing with a non-string value was not upcasting to ``object`` dtype (:issue:`60282`)
- Bug in :meth:`Series.str.center` with :class:`StringDtype` with ``storage="pyarrow"`` not matching the python behavior in corner cases with an odd number of fill characters (:issue:`54792`)
- Bug in :meth:`Series.str.replace` when ``n < 0`` for :class:`StringDtype` with ``storage="pyarrow"`` (:issue:`59628`)
- Bug in ``ser.str.slice`` with negative ``step`` with :class:`ArrowDtype` and :class:`StringDtype` with ``storage="pyarrow"`` giving incorrect results (:issue:`59710`)
- Bug in the ``center`` method on :class:`Series` and :class:`Index` object ``str`` accessors with pyarrow-backed dtype not matching the python behavior in corner cases with an odd number of fill characters (:issue:`54792`)

Interval
^^^^^^^^
-
-
- Bug in :meth:`Series.str.slice` with negative ``step`` with :class:`ArrowDtype` and :class:`StringDtype` with ``storage="pyarrow"`` giving incorrect results (:issue:`59710`)

Indexing
^^^^^^^^
- Fixed bug in :meth:`Index.get_indexer` round-tripping through string dtype when ``infer_string`` is enabled (:issue:`55834`)
-

Missing
^^^^^^^
-
-

MultiIndex
^^^^^^^^^^
-
-
- Bug in :meth:`Index.get_indexer` round-tripping through string dtype when ``infer_string`` is enabled (:issue:`55834`)

I/O
^^^
-
-

Period
^^^^^^
-
-

Plotting
^^^^^^^^
-
-

Groupby/resample/rolling
^^^^^^^^^^^^^^^^^^^^^^^^
-
-

Reshaping
^^^^^^^^^
-
-

Sparse
^^^^^^
-
-

ExtensionArray
^^^^^^^^^^^^^^
-
-

Styler
^^^^^^
-
-
- Bug in :meth:`DataFrame.to_excel` which stored decimals as strings instead of numbers (:issue:`49598`)

Other
^^^^^
Expand All @@ -196,3 +114,5 @@ Other

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

.. contributors:: v2.2.3..v2.3.0|HEAD
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