v1.3.3.rst

What's new in 1.3.3 (September 12, 2021)

These are the changes in pandas 1.3.3. See :ref:`release` for a full changelog including other versions of pandas.

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Fixed regressions

• Fixed regression in :class:`DataFrame` constructor failing to broadcast for defined :class:`Index` and len one list of :class:`Timestamp` (:issue:`42810`)
• Fixed regression in :meth:`.GroupBy.agg` incorrectly raising in some cases (:issue:`42390`)
• Fixed regression in :meth:`.GroupBy.apply` where nan values were dropped even with dropna=False (:issue:`43205`)
• Fixed regression in :meth:`.GroupBy.quantile` which was failing with pandas.NA (:issue:`42849`)
• Fixed regression in :meth:`merge` where on columns with ExtensionDtype or bool data types were cast to object in right and outer merge (:issue:`40073`)
• Fixed regression in :meth:`RangeIndex.where` and :meth:`RangeIndex.putmask` raising AssertionError when result did not represent a :class:`RangeIndex` (:issue:`43240`)
• Fixed regression in :meth:`read_parquet` where the fastparquet engine would not work properly with fastparquet 0.7.0 (:issue:`43075`)
• Fixed regression in :meth:`DataFrame.loc.__setitem__` raising ValueError when setting array as cell value (:issue:`43422`)
• Fixed regression in :func:`is_list_like` where objects with __iter__ set to None would be identified as iterable (:issue:`43373`)
• Fixed regression in :meth:`DataFrame.__getitem__` raising error for slice of :class:`DatetimeIndex` when index is non monotonic (:issue:`43223`)
• Fixed regression in :meth:`.Resampler.aggregate` when used after column selection would raise if func is a list of aggregation functions (:issue:`42905`)
• Fixed regression in :meth:`DataFrame.corr` where Kendall correlation would produce incorrect results for columns with repeated values (:issue:`43401`)
• Fixed regression in :meth:`DataFrame.groupby` where aggregation on columns with object types dropped results on those columns (:issue:`42395`, :issue:`43108`)
• Fixed regression in :meth:`Series.fillna` raising TypeError when filling float Series with list-like fill value having a dtype which couldn't cast lostlessly (like float32 filled with float64) (:issue:`43424`)
• Fixed regression in :func:`read_csv` raising AttributeError when the file handle is an tempfile.SpooledTemporaryFile object (:issue:`43439`)
• Fixed performance regression in :meth:`core.window.ewm.ExponentialMovingWindow.mean` (:issue:`42333`)

Performance improvements

• Performance improvement for :meth:`DataFrame.__setitem__` when the key or value is not a :class:`DataFrame`, or key is not list-like (:issue:`43274`)

Bug fixes

• Fixed bug in :meth:`.DataFrameGroupBy.agg` and :meth:`.DataFrameGroupBy.transform` with engine="numba" where index data was not being correctly passed into func (:issue:`43133`)

Contributors

.. contributors:: v1.3.2..v1.3.3