What's new in 1.4.2 (March ??, 2022)

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 regressions

Fixed regression in :meth:`DataFrame.drop` and :meth:`Series.drop` when :class:`Index` had extension dtype and duplicates (:issue:`45860`)
Fixed memory performance regression in :meth:`Series.fillna` when called on a :class:`DataFrame` column with inplace=True (:issue:`46149`)

Bug fixes

Fix some cases for subclasses that define their _constructor properties as general callables (:issue:`46018`)
Fixed "longtable" formatting in :meth:`.Styler.to_latex` when column_format is given in extended format (:issue:`46037`)

Other

Contributors

.. contributors:: v1.4.1..v1.4.2|HEAD