What’s new in 2.1.2 (October ??, 2023)#

These are the changes in pandas 2.1.2. See Release notes for a full changelog including other versions of pandas.

Fixed regressions#

Fixed bug in DataFrame.resample() where bin edges were not correct for MonthBegin (GH 55271)
Fixed bug where PDEP-6 warning about setting an item of an incompatible dtype was being shown when creating a new conditional column (GH 55025)
Fixed regression in DataFrame.join() where result has missing values and dtype is arrow backed string (GH 55348)

Fixed bug in Categorical.equals() if other has arrow backed string dtype (GH 55364)
Fixed bug in DataFrame.__setitem__() not inferring string dtype for zero-dimensional array with infer_string=True (GH 55366)
Fixed bug in DataFrame.idxmin() and DataFrame.idxmax() raising for arrow dtypes (GH 55368)
Fixed bug in DataFrame.interpolate() raising incorrect error message (GH 55347)
Fixed bug in DataFrame.resample() not respecting closed and label arguments for BusinessDay (GH 55282)
Fixed bug in DataFrame.resample() where bin edges were not correct for BusinessDay (GH 55281)
Fixed bug in Index.insert() raising when inserting None into Index with dtype="string[pyarrow_numpy]" (GH 55365)
Fixed bug in Series.all() and Series.any() not treating missing values correctly for dtype="string[pyarrow_numpy]" (GH 55367)
Fixed bug in Series.rank() for string[pyarrow_numpy] dtype (GH 55362)
Silence Period[B] warnings introduced by GH 53446 during normal plotting activity (GH 55138)

Fixed non-working installation of optional dependency group output_formatting. Replacing underscore _ with a dash - fixes broken dependency resolution. A correct way to use now is pip install pandas[output-formatting].