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Pull requests: pandas-dev/pandas
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Backport PR #55473: TST: sort index with sliced MultiIndex MultiIndex Regression Functionality that used to work in a prior pandas version
Backport PR #47550 on branch 1.4.x (REGR: fix eval with inplace=True to correctly update column values inplace) expressions pd.eval, query Regression Functionality that used to work in a prior pandas version
PERF: Index.searchsorted Performance Memory or execution speed performance Regression Functionality that used to work in a prior pandas version
BUG: reset_index is passing a bad dtype to NumPy Dtype Conversions Unexpected or buggy dtype conversions ExtensionArray Extending pandas with custom dtypes or arrays. Indexing Related to indexing on series/frames, not to indexes themselves Regression Functionality that used to work in a prior pandas version Reshaping Concat, Merge/Join, Stack/Unstack, Explode
BUG: Categorical.fillna with iterables Categorical Categorical Data Type Missing-data np.nan, pd.NaT, pd.NA, dropna, isnull, interpolate Regression Functionality that used to work in a prior pandas version
REGR: sort index with sliced MultiIndex MultiIndex Regression Functionality that used to work in a prior pandas version
REGR: DataFrame.update emits spurious warning about downcasting Bug Conditionals E.g. where, mask, case_when DataFrame DataFrame data structure Dtype Conversions Unexpected or buggy dtype conversions Regression Functionality that used to work in a prior pandas version Warnings Warnings that appear or should be added to pandas
REGR: Fixed hash_key=None for object values Regression Functionality that used to work in a prior pandas version
REGR: Fix casting of None to str during astype Regression Functionality that used to work in a prior pandas version Strings String extension data type and string data
BUG: fix comparison of NaT with numpy array Datetime Datetime data dtype Missing-data np.nan, pd.NaT, pd.NA, dropna, isnull, interpolate Numeric Operations Arithmetic, Comparison, and Logical operations Regression Functionality that used to work in a prior pandas version
REGR: Fix to_csv with IntervalIndex Interval Interval data type IO CSV read_csv, to_csv Regression Functionality that used to work in a prior pandas version
Bug in RangeIndex.where raising AssertionError when result is not from RangeIndex Index Related to the Index class or subclasses Regression Functionality that used to work in a prior pandas version
BUG: groupby nunique changing values Groupby Regression Functionality that used to work in a prior pandas version
BUG: Fix Categorical.min / max bug Categorical Categorical Data Type Regression Functionality that used to work in a prior pandas version
REGR: Dataframe.reset_index() on empty DataFrame with MI and datatime level Bug MultiIndex Regression Functionality that used to work in a prior pandas version Reshaping Concat, Merge/Join, Stack/Unstack, Explode
REGR: Make DateOffset immutable Datetime Datetime data dtype Frequency DateOffsets Regression Functionality that used to work in a prior pandas version
REGR: revert behaviour of getitem with assigning with a Series Indexing Related to indexing on series/frames, not to indexes themselves Regression Functionality that used to work in a prior pandas version
REGR: inplace Series op not actually operating inplace Copy / view semantics Regression Functionality that used to work in a prior pandas version
BUG: Fix regression in pandas merge Regression Functionality that used to work in a prior pandas version Reshaping Concat, Merge/Join, Stack/Unstack, Explode
REGR: isin raising TypeError for RangeIndex Index Related to the Index class or subclasses Regression Functionality that used to work in a prior pandas version Upstream issue Issue related to pandas dependency
REGR: Group empty Series Groupby Regression Functionality that used to work in a prior pandas version
BUG: Don't segfault to_numeric when input is empty Numeric Operations Arithmetic, Comparison, and Logical operations Regression Functionality that used to work in a prior pandas version
REGR: bug in moments when using bottleneck Numeric Operations Arithmetic, Comparison, and Logical operations Regression Functionality that used to work in a prior pandas version
BUG: Compare names with None in DataFrame ctor Bug Dtype Conversions Unexpected or buggy dtype conversions Regression Functionality that used to work in a prior pandas version
REGR: nanosecond timestamp comparisons to OOB datetimes Datetime Datetime data dtype Numeric Operations Arithmetic, Comparison, and Logical operations Regression Functionality that used to work in a prior pandas version
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ProTip! What’s not been updated in a month: updated:<2025-11-01.