These are the changes in pandas 2.1.4. See :ref:`release` for a full changelog including other versions of pandas.
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- Fixed regression when trying to read a pickled pandas :class:`DataFrame` from pandas 1.3 (:issue:`55137`)
- Bug in :class:`Series` constructor raising DeprecationWarning when
indexis a list of :class:`Series` (:issue:`55228`) - Bug in :class:`Series` when trying to cast date-like string inputs to :class:`ArrowDtype` of
pyarrow.timestamp(:issue:`56266`) - Bug in :class:`Timestamp` construction with
ts_input="now"orts_input="today"giving a different unit from :meth:`Timestamp.now` or :meth:`Timestamp.today` (:issue:`55879`) - Bug in :meth:`DataFrame.resample` changing index type to :class:`MultiIndex` when the dataframe is empty and using an upsample method (:issue:`55572`)
- Bug in :meth:`Index.__getitem__` returning wrong result for Arrow dtypes and negative stepsize (:issue:`55832`)
- Fixed bug in :func:`read_csv` not respecting object dtype when
infer_stringoption is set (:issue:`56047`) - Fixed bug in :func:`to_numeric` converting to extension dtype for
string[pyarrow_numpy]dtype (:issue:`56179`) - Fixed bug in :meth:`.DataFrameGroupBy.min` and :meth:`.DataFrameGroupBy.max` not preserving extension dtype for empty object (:issue:`55619`)
- Fixed bug in :meth:`DataFrame.__setitem__` casting :class:`Index` with object-dtype to PyArrow backed strings when
infer_stringoption is set (:issue:`55638`) - Fixed bug in :meth:`DataFrame.to_hdf` raising when columns have
StringDtype(:issue:`55088`) - Fixed bug in :meth:`Index.insert` casting object-dtype to PyArrow backed strings when
infer_stringoption is set (:issue:`55638`) - Fixed bug in :meth:`Series.__ne__` resulting in False for comparison between
NAand string value fordtype="string[pyarrow_numpy]"(:issue:`56122`) - Fixed bug in :meth:`Series.mode` not keeping object dtype when
infer_stringis set (:issue:`56183`) - Fixed bug in :meth:`Series.reset_index` not preserving object dtype when
infer_stringis set (:issue:`56160`) - Fixed bug in :meth:`Series.str.split` and :meth:`Series.str.rsplit` when
pat=Nonefor :class:`ArrowDtype` withpyarrow.string(:issue:`56271`) - Fixed bug in :meth:`Series.str.translate` losing object dtype when string option is set (:issue:`56152`)
.. contributors:: v2.1.3..v2.1.4|HEAD