DEPR: Categorical with values not present in categories #62142
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rhshadrach
reviewed
Aug 20, 2025
pandas/core/arrays/categorical.py
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| warnings.filterwarnings( | ||
| "ignore", | ||
| "Constructing a Categorical with a dtype and values", | ||
| FutureWarning, | ||
| ) | ||
| res = cls._from_sequence(scalars, dtype=dtype) |
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What happens here once the deprecation is enforced?
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| codes = recode_for_categories( | ||
| cat.codes, cat.categories, new_dtype.categories, copy=False | ||
| cat.codes, cat.categories, new_dtype.categories, copy=False, warn=False |
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When the deprecation is enforced, do we still need to pass the flag on whether to allow values outside the categories?
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the flag will become a "should we raise" flag, and will still be needed bc the answer will be "no" for set_categories
| @@ -258,6 +258,12 @@ def _is_dtype_compat(self, other: Index) -> Categorical: | |||
| else: | |||
| values = other | |||
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| codes = self.categories.get_indexer(values) | |||
| if ((codes == -1) & ~values.isna()).any(): | |||
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Do we still need the check on L269 with this?
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i think not, will check and update
pandas/tests/dtypes/test_dtypes.py
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| # [c, None, None, dtype2, dtype2], | ||
| # [c, ["x", "y"], False, None, dtype2], |
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good catch, will update
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astypemethod fails to raise errors forcategorydata type #59899doc/source/whatsnew/vX.X.X.rstfile if fixing a bug or adding a new feature.