What’s new in 1.5.2 (November 21, 2022)#

These are the changes in pandas 1.5.2. See Release notes for a full changelog including other versions of pandas.

Fixed regressions#

Fixed regression in MultiIndex.join() for extension array dtypes (GH49277)
Fixed regression in Series.replace() raising RecursionError with numeric dtype and when specifying value=None (GH45725)
Fixed regression in arithmetic operations for DataFrame with MultiIndex columns with different dtypes (GH49769)
Fixed regression in DataFrame.plot() preventing Colormap instance from being passed using the colormap argument if Matplotlib 3.6+ is used (GH49374)
Fixed regression in date_range() returning an invalid set of periods for CustomBusinessDay frequency and start date with timezone (GH49441)
Fixed performance regression in groupby operations (GH49676)
Fixed regression in Timedelta constructor returning object of wrong type when subclassing Timedelta (GH49579)

Bug in the Copy-on-Write implementation losing track of views in certain chained indexing cases (GH48996)
Fixed memory leak in Styler.to_excel() (GH49751)

Reverted color as an alias for c and size as an alias for s in function DataFrame.plot.scatter() (GH49732)

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