diff --git a/doc/source/whatsnew/v2.3.0.rst b/doc/source/whatsnew/v2.3.0.rst index 65a1c55f674b4..317d7ddfed401 100644 --- a/doc/source/whatsnew/v2.3.0.rst +++ b/doc/source/whatsnew/v2.3.0.rst @@ -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 @@ -10,23 +10,11 @@ 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 @@ -34,14 +22,13 @@ 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 `_ 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: @@ -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: @@ -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 ^^^^^ @@ -196,3 +114,5 @@ Other Contributors ~~~~~~~~~~~~ + +.. contributors:: v2.2.3..v2.3.0|HEAD