What's new in 1.4.1 (February ??, 2022)

These are the changes in pandas 1.4.1. See :ref:`release` for a full changelog including other versions of pandas.

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Fixed regressions

Regression in :meth:`Series.mask` with inplace=True and PeriodDtype and an incompatible other coercing to a common dtype instead of raising (:issue:`45546`)
Regression in :meth:`DataFrame.loc.__setitem__` losing :class:`Index` name if :class:`DataFrame` was empty before (:issue:`45621`)

Bug fixes

Fixed segfault in :meth:DataFrame.to_json when dumping tz-aware datetimes in Python 3.10 (:issue:`42130`)
Fixed window aggregations in :meth:`DataFrame.rolling` and :meth:`Series.rolling` to skip over unused elements (:issue:`45647`)

Other

Reverted performance speedup of :meth:`DataFrame.corr` for method=pearson to fix precision regression (:issue:`45640`, :issue:`42761`)

Contributors

.. contributors:: v1.4.0..v1.4.1|HEAD