What’s new in 1.1.5 (December 07, 2020)

These are the changes in pandas 1.1.5. See Release notes for a full changelog including other versions of pandas.

Fixed regressions

• Fixed regression in addition of a timedelta-like scalar to a DatetimeIndex raising incorrectly (GH37295)

• Fixed regression in Series.groupby() raising when the Index of the Series had a tuple as its name (GH37755)

• Fixed regression in DataFrame.loc() and Series.loc() for __setitem__ when one-dimensional tuple was given to select from MultiIndex (GH37711)

• Fixed regression in inplace operations on Series with ExtensionDtype with NumPy dtyped operand (GH37910)

• Fixed regression in metadata propagation for groupby iterator (GH37343)

• Fixed regression in MultiIndex constructed from a DatetimeIndex not retaining frequency (GH35563)

• Fixed regression in Index constructor raising a AttributeError when passed a SparseArray with datetime64 values (GH35843)

• Fixed regression in DataFrame.unstack() with columns with integer dtype (GH37115)

• Fixed regression in indexing on a Series with CategoricalDtype after unpickling (GH37631)

• Fixed regression in DataFrame.groupby() aggregation with out-of-bounds datetime objects in an object-dtype column (GH36003)

• Fixed regression in df.groupby(..).rolling(..) with the resulting MultiIndex when grouping by a label that is in the index (GH37641)

• Fixed regression in DataFrame.fillna() not filling NaN after other operations such as DataFrame.pivot() (GH36495).

• Fixed performance regression in df.groupby(..).rolling(..) (GH38038)

• Fixed regression in MultiIndex.intersection() returning duplicates when at least one of the indexes had duplicates (GH36915)

• Fixed regression in DataFrameGroupBy.first(), SeriesGroupBy.first(), DataFrameGroupBy.last(), and SeriesGroupBy.last() where None was considered a non-NA value (GH38286)

Bug fixes

• Bug in pytables methods in python 3.9 (GH38041)

Other

• Only set -Werror as a compiler flag in the CI jobs (GH33315, GH33314)

Contributors

A total of 12 people contributed patches to this release. People with a “+” by their names contributed a patch for the first time.

• Andrew Wieteska

• Fangchen Li

• Janus

• Joris Van den Bossche

• Matthew Roeschke

• MeeseeksMachine

• Pandas Development Team

• Richard Shadrach

• Simon Hawkins

• Uwe L. Korn

• jbrockmendel

• patrick