These are the changes in pandas 1.1.5. See :ref:`release` for a full changelog including other versions of pandas.
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- Fixed regression in addition of a timedelta-like scalar to a :class:`DatetimeIndex` raising incorrectly (:issue:`37295`)
- Fixed regression in :meth:`Series.groupby` raising when the :class:`Index` of the :class:`Series` had a tuple as its name (:issue:`37755`)
- Fixed regression in :meth:`DataFrame.loc` and :meth:`Series.loc` for
__setitem__when one-dimensional tuple was given to select from :class:`MultiIndex` (:issue:`37711`) - Fixed regression in inplace operations on :class:`Series` with
ExtensionDtypewith NumPy dtyped operand (:issue:`37910`) - Fixed regression in metadata propagation for
groupbyiterator (:issue:`37343`) - Fixed regression in :class:`MultiIndex` constructed from a :class:`DatetimeIndex` not retaining frequency (:issue:`35563`)
- Fixed regression in :meth:`DataFrame.unstack` with columns with integer dtype (:issue:`37115`)
- Fixed regression in indexing on a :class:`Series` with
CategoricalDtypeafter unpickling (:issue:`37631`) - Fixed regression in :meth:`DataFrame.groupby` aggregation with out-of-bounds datetime objects in an object-dtype column (:issue:`36003`)
- Fixed regression in
df.groupby(..).rolling(..)with the resulting :class:`MultiIndex` when grouping by a label that is in the index (:issue:`37641`) - Fixed regression in :meth:`DataFrame.fillna` not filling
NaNafter other operations such as :meth:`DataFrame.pivot` (:issue:`36495`). - Fixed performance regression in
df.groupby(..).rolling(..)(:issue:`38038`) - Fixed regression in :meth:`MultiIndex.intersection` returning duplicates when at least one of the indexes had duplicates (:issue:`36915`)
- Bug in pytables methods in python 3.9 (:issue:`38041`)
- Only set
-Werroras a compiler flag in the CI jobs (:issue:`33315`, :issue:`33314`)
.. contributors:: v1.1.4..v1.1.5|HEAD