What’s new in 1.3.2 (August 15, 2021)

These are the changes in pandas 1.3.2. See Release notes for a full changelog including other versions of pandas.

Fixed regressions

• Performance regression in DataFrame.isin() and Series.isin() for nullable data types (GH42714)

• Regression in updating values of Series using boolean index, created by using DataFrame.pop() (GH42530)

• Regression in DataFrame.from_records() with empty records (GH42456)

• Fixed regression in DataFrame.shift() where TypeError occurred when shifting DataFrame created by concatenation of slices and fills with values (GH42719)

• Regression in DataFrame.agg() when the func argument returned lists and axis=1 (GH42727)

• Regression in DataFrame.drop() does nothing if MultiIndex has duplicates and indexer is a tuple or list of tuples (GH42771)

• Fixed regression where read_csv() raised a ValueError when parameters names and prefix were both set to None (GH42387)

• Fixed regression in comparisons between Timestamp object and datetime64 objects outside the implementation bounds for nanosecond datetime64 (GH42794)

• Fixed regression in Styler.highlight_min() and Styler.highlight_max() where pandas.NA was not successfully ignored (GH42650)

• Fixed regression in concat() where copy=False was not honored in axis=1 Series concatenation (GH42501)

• Regression in Series.nlargest() and Series.nsmallest() with nullable integer or float dtype (GH42816)

• Fixed regression in Series.quantile() with Int64Dtype (GH42626)

• Fixed regression in Series.groupby() and DataFrame.groupby() where supplying the by argument with a Series named with a tuple would incorrectly raise (GH42731)

Bug fixes

• Bug in read_excel() modifies the dtypes dictionary when reading a file with duplicate columns (GH42462)

• 1D slices over extension types turn into N-dimensional slices over ExtensionArrays (GH42430)

• Fixed bug in Series.rolling() and DataFrame.rolling() not calculating window bounds correctly for the first row when center=True and window is an offset that covers all the rows (GH42753)

• Styler.hide_columns() now hides the index name header row as well as column headers (GH42101)

• Styler.set_sticky() has amended CSS to control the column/index names and ensure the correct sticky positions (GH42537)

• Bug in de-serializing datetime indexes in PYTHONOPTIMIZED mode (GH42866)

Contributors

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

• Alexander Gorodetsky +

• Fangchen Li

• Fred Reiss

• Justin McOmie +

• Matthew Zeitlin

• MeeseeksMachine

• Pandas Development Team

• Patrick Hoefler

• Richard Shadrach

• Shoham Debnath

• Simon Hawkins

• Thomas Li

• Wenjun Si

• attack68

• dicristina +

• jbrockmendel