What’s new in 1.1.1 (August 20, 2020) — pandas 2.2.3 documentation (original) (raw)

These are the changes in pandas 1.1.1. See Release notes for a full changelog including other versions of pandas.

Fixed regressions#

• Fixed regression in CategoricalIndex.format() where, when stringified scalars had different lengths, the shorter string would be right-filled with spaces, so it had the same length as the longest string (GH 35439)
• Fixed regression in Series.truncate() when trying to truncate a single-element series (GH 35544)
• Fixed regression where DataFrame.to_numpy() would raise a RuntimeError for mixed dtypes when converting to str (GH 35455)
• Fixed regression where read_csv() would raise a ValueError when pandas.options.mode.use_inf_as_na was set to True (GH 35493)
• Fixed regression where pandas.testing.assert_series_equal() would raise an error when non-numeric dtypes were passed with check_exact=True (GH 35446)
• Fixed regression in .groupby(..).rolling(..) where column selection was ignored (GH 35486)
• Fixed regression where DataFrame.interpolate() would raise a TypeError when the DataFrame was empty (GH 35598)
• Fixed regression in DataFrame.shift() with axis=1 and heterogeneous dtypes (GH 35488)
• Fixed regression in DataFrame.diff() with read-only data (GH 35559)
• Fixed regression in .groupby(..).rolling(..) where a segfault would occur with center=True and an odd number of values (GH 35552)
• Fixed regression in DataFrame.apply() where functions that altered the input in-place only operated on a single row (GH 35462)
• Fixed regression in DataFrame.reset_index() would raise a ValueError on empty DataFrame with a MultiIndex with a datetime64 dtype level (GH 35606, GH 35657)
• Fixed regression where pandas.merge_asof() would raise a UnboundLocalError when left_index, right_index and tolerance were set (GH 35558)
• Fixed regression in .groupby(..).rolling(..) where a custom BaseIndexer would be ignored (GH 35557)
• Fixed regression in DataFrame.replace() and Series.replace() where compiled regular expressions would be ignored during replacement (GH 35680)
• Fixed regression in DataFrameGroupBy.aggregate() where a list of functions would produce the wrong results if at least one of the functions did not aggregate (GH 35490)
• Fixed memory usage issue when instantiating large pandas.arrays.StringArray (GH 35499)

Bug fixes#

• Bug in Styler whereby cell_ids argument had no effect due to other recent changes (GH 35588) (GH 35663)
• Bug in pandas.testing.assert_series_equal() and pandas.testing.assert_frame_equal() where extension dtypes were not ignored when check_dtypes was set to False (GH 35715)
• Bug in to_timedelta() fails when arg is a Series with Int64 dtype containing null values (GH 35574)
• Bug in .groupby(..).rolling(..) where passing closed with column selection would raise a ValueError (GH 35549)
• Bug in DataFrame constructor failing to raise ValueError in some cases when data and index have mismatched lengths (GH 33437)

Contributors#

A total of 20 people contributed patches to this release. People with a “+” by their names contributed a patch for the first time.

• Ali McMaster
• Daniel Saxton
• Eric Goddard +
• Fangchen Li
• Isaac Virshup
• Joris Van den Bossche
• Kevin Sheppard
• Matthew Roeschke
• MeeseeksMachine +
• Pandas Development Team
• Richard Shadrach
• Simon Hawkins
• Terji Petersen
• Tom Augspurger
• Yutaro Ikeda +
• attack68 +
• edwardkong +
• gabicca +
• jbrockmendel
• sanderland +