What's new in 1.4.3 (April ??, 2022)

These are the changes in pandas 1.4.3. See :ref:`release` for a full changelog including other versions of pandas.

Fixed regressions

Fixed regression in :meth:`DataFrame.replace` when the replacement value was explicitly None when passed in a dictionary to to_replace also casting other columns to object dtype even when there were no values to replace (:issue:`46634`)
Fixed regression in :meth:`DataFrame.nsmallest` led to wrong results when np.nan in the sorting column (:issue:`46589`)
Fixed regression in :func:`read_fwf` raising ValueError when widths was specified with usecols (:issue:`46580`)
Fixed regression in :meth:`.Groupby.transform` and :meth:`.Groupby.agg` failing with engine="numba" when the index was a :class:`MultiIndex` (:issue:`46867`)
Fixed regression is :meth:`.Styler.to_latex` and :meth:`.Styler.to_html` where buf failed in combination with encoding (:issue:`47053`)
Fixed regression in :func:`read_csv` with index_col=False identifying first row as index names when header=None (:issue:`46955`)
Fixed regression in :meth:`.DataFrameGroupBy.agg` when used with list-likes or dict-likes and axis=1 that would give incorrect results; now raises NotImplementedError (:issue:`46995`)
Fixed regression in :meth:`DataFrame.resample` and :meth:`DataFrame.rolling` when used with list-likes or dict-likes and axis=1 that would raise an unintuitive error message; now raises NotImplementedError (:issue:`46904`)

The minimum version of Cython needed to compile pandas is now 0.29.30 (:issue:`41935`)

.. contributors:: v1.4.2..v1.4.3|HEAD