What’s new in 1.1.2 (September 8, 2020)

These are the changes in pandas 1.1.2. See Release notes for a full changelog including other versions of pandas.

Fixed regressions

• Regression in DatetimeIndex.intersection() incorrectly raising AssertionError when intersecting against a list (GH35876)

• Fix regression in updating a column inplace (e.g. using df['col'].fillna(.., inplace=True)) (GH35731)

• Fix regression in DataFrame.append() mixing tz-aware and tz-naive datetime columns (GH35460)

• Performance regression for RangeIndex.format() (GH35712)

• Regression where MultiIndex.get_loc() would return a slice spanning the full index when passed an empty list (GH35878)

• Fix regression in invalid cache after an indexing operation; this can manifest when setting which does not update the data (GH35521)

• Regression in DataFrame.replace() where a TypeError would be raised when attempting to replace elements of type Interval (GH35931)

• Fix regression in pickle roundtrip of the closed attribute of IntervalIndex (GH35658)

• Fixed regression in DataFrameGroupBy.agg() where a ValueError: buffer source array is read-only would be raised when the underlying array is read-only (GH36014)

• Fixed regression in Series.groupby.rolling() number of levels of MultiIndex in input was compressed to one (GH36018)

• Fixed regression in DataFrameGroupBy on an empty DataFrame (GH36197)

Bug fixes

• Bug in DataFrame.eval() with object dtype column binary operations (GH35794)

• Bug in Series constructor raising a TypeError when constructing sparse datetime64 dtypes (GH35762)

• Bug in DataFrame.apply() with result_type="reduce" returning with incorrect index (GH35683)

• Bug in Series.astype() and DataFrame.astype() not respecting the errors argument when set to "ignore" for extension dtypes (GH35471)

• Bug in DateTimeIndex.format() and PeriodIndex.format() with name=True setting the first item to "None" where it should be "" (GH35712)

• Bug in Float64Index.__contains__() incorrectly raising TypeError instead of returning False (GH35788)

• Bug in Series constructor incorrectly raising a TypeError when passed an ordered set (GH36044)

• Bug in Series.dt.isocalendar() and DatetimeIndex.isocalendar() that returned incorrect year for certain dates (GH36032)

• Bug in DataFrame indexing returning an incorrect Series in some cases when the series has been altered and a cache not invalidated (GH33675)

• Bug in DataFrame.corr() causing subsequent indexing lookups to be incorrect (GH35882)

• Bug in import_optional_dependency() returning incorrect package names in cases where package name is different from import name (GH35948)

• Bug when setting empty DataFrame column to a Series in preserving name of index in frame (GH31368)

Other

• factorize() now supports na_sentinel=None to include NaN in the uniques of the values and remove dropna keyword which was unintentionally exposed to public facing API in 1.1 version from factorize() (GH35667)

• DataFrame.plot() and Series.plot() raise UserWarning about usage of FixedFormatter and FixedLocator (GH35684 and GH35945)

Contributors

A total of 16 people contributed patches to this release. People with a “+” by their names contributed a patch for the first time.

• Ali McMaster

• Asish Mahapatra

• Daniel Saxton

• Fangchen Li

• Harsh Sharma +

• Irv Lustig

• Jeet Parekh +

• Joris Van den Bossche

• Kaiqi Dong

• Matthew Roeschke

• MeeseeksMachine

• Pandas Development Team

• Simon Hawkins

• Terji Petersen

• jbrockmendel

• patrick

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What’s new in 1.1.3 (October 5, 2020)

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What’s new in 1.1.1 (August 20, 2020)