What’s new in 1.5.3 (January 18, 2023)

These are the changes in pandas 1.5.3. See Release notes for a full changelog including other versions of pandas.

Fixed regressions

• Fixed performance regression in Series.isin() when values is empty (GH 49839)

• Fixed regression in DataFrame.memory_usage() showing unnecessary FutureWarning when DataFrame is empty (GH 50066)

• Fixed regression in DataFrameGroupBy.transform() when used with as_index=False (GH 49834)

• Enforced reversion of color as an alias for c and size as an alias for s in function DataFrame.plot.scatter() (GH 49732)

• Fixed regression in SeriesGroupBy.apply() setting a name attribute on the result if the result was a DataFrame (GH 49907)

• Fixed performance regression in setting with the at() indexer (GH 49771)

• Fixed regression in to_datetime() raising ValueError when parsing array of float containing np.nan (GH 50237)

Bug fixes

• Bug in the Copy-on-Write implementation losing track of views when indexing a DataFrame with another DataFrame (GH 50630)

• Bug in Styler.to_excel() leading to error when unrecognized border-style (e.g. "hair") provided to Excel writers (GH 48649)

• Bug in Series.quantile() emitting warning from NumPy when Series has only NA values (GH 50681)

• Bug when chaining several Styler.concat() calls, only the last styler was concatenated (GH 49207)

• Fixed bug when instantiating a DataFrame subclass inheriting from typing.Generic that triggered a UserWarning on python 3.11 (GH 49649)

• Bug in pivot_table() with NumPy 1.24 or greater when the DataFrame columns has nested elements (GH 50342)

• Bug in pandas.testing.assert_series_equal() (and equivalent assert_ functions) when having nested data and using numpy >= 1.25 (GH 50360)

Other

Note

If you are using DataFrame.to_sql(), read_sql(), read_sql_table(), or read_sql_query() with SQLAlchemy 1.4.46 or greater, you may see a sqlalchemy.exc.RemovedIn20Warning. These warnings can be safely ignored for the SQLAlchemy 1.4.x releases as pandas works toward compatibility with SQLAlchemy 2.0.

• Reverted deprecation (GH 45324) of behavior of Series.__getitem__() and Series.__setitem__() slicing with an integer Index; this will remain positional (GH 49612)

• A FutureWarning raised when attempting to set values inplace with DataFrame.loc() or DataFrame.iloc() has been changed to a DeprecationWarning (GH 48673)

Contributors

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