These are the changes in pandas 1.4.2. See :ref:`release` for a full changelog including other versions of pandas.
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- Fixed regression in :meth:`DataFrame.drop` and :meth:`Series.drop` when :class:`Index` had extension dtype and duplicates (:issue:`45860`)
- Fixed regression in :func:`read_csv` killing python process when invalid file input was given for
engine="c"(:issue:`45957`) - Fixed memory performance regression in :meth:`Series.fillna` when called on a :class:`DataFrame` column with
inplace=True(:issue:`46149`) - Provided an alternative solution for passing custom Excel formats in :meth:`.Styler.to_excel`, which was a regression based on stricter CSS validation. Examples available in the documentation for :meth:`.Styler.format` (:issue:`46152`)
- Fixed regression in :meth:`DataFrame.replace` when a replacement value was also a target for replacement (:issue:`46306`)
- Fixed regression in :meth:`DataFrame.replace` when the replacement value was explicitly
Nonewhen passed in a dictionary toto_replace(:issue:`45601`, :issue:`45836`) - Fixed regression when setting values with :meth:`DataFrame.loc` losing :class:`MultiIndex` names if :class:`DataFrame` was empty before (:issue:`46317`)
- Fixed regression when rendering boolean datatype columns with :meth:`.Styler` (:issue:`46384`)
- Fixed regression in :meth:`Groupby.rolling` with a frequency window that would raise a
ValueErroreven if the datetimes within each group were monotonic (:issue:`46061`)
- Fix some cases for subclasses that define their
_constructorproperties as general callables (:issue:`46018`) - Fixed "longtable" formatting in :meth:`.Styler.to_latex` when
column_formatis given in extended format (:issue:`46037`) - Fixed incorrect rendering in :meth:`.Styler.format` with
hyperlinks="html"when the url contains a colon or other special characters (:issue:`46389`) - Improved error message in :class:`.Rolling` when
windowis a frequency andNaTis in the rolling axis (:issue:`46087`)
.. contributors:: v1.4.1..v1.4.2