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Pull requests: pandas-dev/pandas
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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
Backport PR #55473: TST: sort index with sliced MultiIndex MultiIndex 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: NumPy func warning when dropping nuisance in agg, apply, transform Apply Apply, Aggregate, Transform, Map Nuisance Columns Identifying/Dropping nuisance columns in reductions, groupby.add, DataFrame.apply Regression Functionality that used to work in a prior pandas version Warnings Warnings that appear or should be added to pandas
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
Backport PR #47581 on branch 1.4.x (BUG: DataFrame.loc not aligning rhs df for single block case) Indexing Related to indexing on series/frames, not to indexes themselves Regression Functionality that used to work in a prior pandas version
BUG: Fix nanosecond timedeltas Regression Functionality that used to work in a prior pandas version Timedelta Timedelta data type
Fixed regression in Series.duplicated for categorical dtype with bool categories 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: RollingGroupby.corr producing incorrect results Bug Groupby Regression Functionality that used to work in a prior pandas version Window rolling, ewma, expanding
BUG: REGR: read_csv with memory_map=True raises UnicodeDecodeError: 'utf-8' codec can't decode byte 0xc4 in position 262143: unexpected end of data IO CSV read_csv, to_csv Regression Functionality that used to work in a prior pandas version
PERF: groupby with string dtype Groupby Performance Memory or execution speed performance Regression Functionality that used to work in a prior pandas version Strings String extension data type and string data
REGR: fillna on f32 column raising for f64 Dtype Conversions Unexpected or buggy dtype conversions Indexing Related to indexing on series/frames, not to indexes themselves Missing-data np.nan, pd.NaT, pd.NA, dropna, isnull, interpolate Regression Functionality that used to work in a prior pandas version
Regression in loc setitem raising ValueError when setting array as cell value Indexing Related to indexing on series/frames, not to indexes themselves Regression Functionality that used to work in a prior pandas version
Regression in __getitem__ raising for slice DatetimeIndex Datetime Datetime data dtype Indexing Related to indexing on series/frames, not to indexes themselves Regression Functionality that used to work in a prior pandas version
REGR: Resampler.aggregate fails when used with column selection Bug Regression Functionality that used to work in a prior pandas version Resample resample method
Revert Cythonized Kendall implementation and improve test case to prevent regressions Algos Non-arithmetic algos: value_counts, factorize, sorting, isin, clip, shift, diff 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.apply incorrectly dropping nan Groupby Regression Functionality that used to work in a prior pandas version
REGR: window ewm slowdown Performance Memory or execution speed performance Regression Functionality that used to work in a prior pandas version Window rolling, ewma, expanding
Fix len one list dataframe constructor bug for datetime Constructors Series/DataFrame/Index/pd.array Constructors DataFrame DataFrame data structure Regression Functionality that used to work in a prior pandas version
REGR: sample modifying Non-arithmetic algos: value_counts, factorize, sorting, isin, clip, shift, diff Regression Functionality that used to work in a prior pandas version
weights inplace Algos REGR: Series.nlargest with masked arrays NA - MaskedArrays Related to pd.NA and nullable extension arrays 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
REGR: ValueError raised when both prefix and names are set to None IO CSV read_csv, to_csv Regression Functionality that used to work in a prior pandas version
BUG: Fix bug in SeriesGroupBy.value_counts when DataFrame has one row (#42618) Bug Groupby Regression Functionality that used to work in a prior pandas version
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