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 GroupBy.first() and GroupBy.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¶

For contributors, please see /usr/share/doc/contributors_list.txt or https://github.com/pandas-dev/pandas/graphs/contributors

What’s new in 1.2.0 (December 26, 2020)

What’s new in 1.1.4 (October 30, 2020)