What’s new in 1.1.4 (October 30, 2020) — pandas 2.2.3 documentation (original) (raw)

These are the changes in pandas 1.1.4. See Release notes for a full changelog including other versions of pandas.

Fixed regressions#

• Fixed regression in read_csv() raising a ValueError when names was of type dict_keys (GH 36928)
• Fixed regression in read_csv() with more than 1M rows and specifying a index_col argument (GH 37094)
• Fixed regression where attempting to mutate a DateOffset object would no longer raise an AttributeError (GH 36940)
• Fixed regression where DataFrame.agg() would fail with TypeError when passed positional arguments to be passed on to the aggregation function (GH 36948).
• Fixed regression in RollingGroupby with sort=False not being respected (GH 36889)
• Fixed regression in Series.astype() converting None to "nan" when casting to string (GH 36904)
• Fixed regression in Series.rank() method failing for read-only data (GH 37290)
• Fixed regression in RollingGroupby causing a segmentation fault with Index of dtype object (GH 36727)
• Fixed regression in DataFrame.resample(...).apply(...)() raised AttributeError when input was a DataFrame and only a Series was evaluated (GH 36951)
• Fixed regression in DataFrame.groupby(..).std() with nullable integer dtype (GH 37415)
• Fixed regression in PeriodDtype comparing both equal and unequal to its string representation (GH 37265)
• Fixed regression where slicing DatetimeIndex raised AssertionError on irregular time series with pd.NaT or on unsorted indices (GH 36953 and GH 35509)
• Fixed regression in certain offsets (pd.offsets.Day() and below) no longer being hashable (GH 37267)
• Fixed regression in StataReader which required chunksize to be manually set when using an iterator to read a dataset (GH 37280)
• Fixed regression in setitem with DataFrame.iloc() which raised error when trying to set a value while filtering with a boolean list (GH 36741)
• Fixed regression in setitem with a Series getting aligned before setting the values (GH 37427)
• Fixed regression in MultiIndex.is_monotonic_increasing returning wrong results with NaN in at least one of the levels (GH 37220)
• Fixed regression in inplace arithmetic operation (+=) on a Series not updating the parent DataFrame/Series (GH 36373)

Bug fixes#

• Bug causing groupby(...).sum() and similar to not preserve metadata (GH 29442)
• Bug in Series.isin() and DataFrame.isin() raising a ValueError when the target was read-only (GH 37174)
• Bug in DataFrameGroupBy.fillna() and SeriesGroupBy.fillna() that introduced a performance regression after 1.0.5 (GH 36757)
• Bug in DataFrame.info() was raising a KeyError when the DataFrame has integer column names (GH 37245)
• Bug in DataFrameGroupby.apply() would drop a CategoricalIndex when grouped on (GH 35792)

Contributors#

A total of 18 people contributed patches to this release. People with a “+” by their names contributed a patch for the first time.

• Daniel Saxton
• Fangchen Li
• Janus +
• Joris Van den Bossche
• Kevin Sheppard
• Marco Gorelli
• Matt Roeschke
• Matthew Roeschke
• MeeseeksMachine
• Pandas Development Team
• Paul Ganssle
• Richard Shadrach
• Simon Hawkins
• Thomas Smith
• Tobias Pitters
• abmyii +
• jbrockmendel
• patrick