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Pull requests: pandas-dev/pandas
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TST: add fillna test for filling with Categorical Categorical Categorical Data Type Missing-data np.nan, pd.NaT, pd.NA, dropna, isnull, interpolate Needs Tests Unit test(s) needed to prevent regressions Stale
#62319 by thaiv28 was closed Nov 1, 2025 Loading…
3 tasks done
BUG: value_counts() check Index with PyArrow categorical columns Algos Non-arithmetic algos: value_counts, factorize, sorting, isin, clip, shift, diff Arrow pyarrow functionality Bug Categorical Categorical Data Type Stale
#60569 by meryadri was closed Jan 27, 2025 Loading…
3 of 5 tasks
Handling conversion of empty categorical with dtype_backend='pyarrow' Bug Categorical Categorical Data Type Stale
BUG: Ensure dataframe preserves categorical indices with categorial series Categorical Categorical Data Type Constructors Series/DataFrame/Index/pd.array Constructors DataFrame DataFrame data structure
#57635 by jmarintur was closed May 31, 2024 Loading…
2 tasks done
ENH: allow better categorical dtype strings, e.g. Categorical Data Type Enhancement Stale
category[string] Categorical #53190 by topper-123 was closed Oct 12, 2023 Loading…
4 of 6 tasks
Bug can't compute cummin/cummax on ordered categorical #52335 Categorical Categorical Data Type Transformations e.g. cumsum, diff, rank
#52870 by YifanChao was closed May 22, 2023 Loading…
5 tasks
BUG: fix bug where appending unordered Categorical Data Type
CategoricalIndex variables overrides index Categorical ENH: Make categories setitem error more readable Categorical Categorical Data Type Error Reporting Incorrect or improved errors from pandas Stale
#47624 by siddartha-10 was closed Aug 15, 2022 Loading…
tocsv_interval _categories Bug Categorical Categorical Data Type IO CSV read_csv, to_csv Regression Functionality that used to work in a prior pandas version
REF: Move Categorical logic from Grouping (#46203) Categorical Categorical Data Type Groupby Refactor Internal refactoring of code
#46207 by NickCrews was closed Mar 8, 2022 Loading…
4 tasks done
BUG: pd.concat produces frames with inconsistent order when concating the ones with categorical indices Categorical Categorical Data Type Reshaping Concat, Merge/Join, Stack/Unstack, Explode Stale
BUG: CategoricalIndex.get_indexer issue with NaNs (#45361) Categorical Categorical Data Type Missing-data np.nan, pd.NaT, pd.NA, dropna, isnull, interpolate
#45373 by Shashank-Shet was merged Jan 28, 2022 Loading…
2 of 4 tasks
DEPR: inplace setting of Categorical.categories Categorical Categorical Data Type Deprecate Functionality to remove in pandas Mothballed Temporarily-closed PR the author plans to return to
ENH: Support observed keyword argument in Categorical.value_counts Categorical Categorical Data Type Enhancement Stale
#44002 by AndrewEckart was closed Feb 22, 2022 Loading…
4 tasks done
TST Providing unit test to snippet GH32414 Categorical Categorical Data Type ExtensionArray Extending pandas with custom dtypes or arrays. Missing-data np.nan, pd.NaT, pd.NA, dropna, isnull, interpolate Testing pandas testing functions or related to the test suite
#43136 by Bhavay-2001 was closed Aug 27, 2021 Loading…
1 task done
REGR: missing vals not replaceable in categorical Categorical Categorical Data Type Regression Functionality that used to work in a prior pandas version replace replace method
#40657 by mzeitlin11 was closed Mar 31, 2021 Loading…
4 tasks done
BUG: read_hdf bad filtering in case of categorical string columns Categorical Categorical Data Type IO HDF5 read_hdf, HDFStore
REG: DataFrame.shift with axis=1 and CategoricalIndex columns Algos Non-arithmetic algos: value_counts, factorize, sorting, isin, clip, shift, diff Bug Categorical Categorical Data Type Regression Functionality that used to work in a prior pandas version
BUG: Categorical.unique should keep dtype unchanged API Design Bug Categorical Categorical Data Type
Deprecate groupby/pivot observed=False default Categorical Categorical Data Type Deprecate Functionality to remove in pandas Needs Discussion Requires discussion from core team before further action Stale
#35967 by jseabold was closed Jul 11, 2021 Loading…
5 tasks done
BUG: Fix is_categorical_dtype for Sparse[category] Categorical Categorical Data Type Dtype Conversions Unexpected or buggy dtype conversions Sparse Sparse Data Type
#35797 by dsaxton was closed Sep 19, 2020 Loading…
5 tasks done
BUG: GroupBy.count() and GroupBy.sum() incorreclty return NaN instead of 0 for missing categories Categorical Categorical Data Type Groupby Missing-data np.nan, pd.NaT, pd.NA, dropna, isnull, interpolate
Categorical.(get|from)_dummies Categorical Categorical Data Type Enhancement Stale
#34426 by clbarnes was closed Mar 21, 2021 Loading…
5 tasks done
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ProTip! Updated in the last three days: updated:>2025-11-28.