Fix mypy errors with newer pandas-stubs #11066
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Remove the pandas-stubs version pin (<=2.2.3.241126) and fix the mypy errors that appear with newer versions. This resolves pydata#10110. Changes by category: 1. Added type: ignore comments with explanatory notes for cases where pandas-stubs is stricter than actual pandas behavior: - CFTimeIndex.__add__/__radd__ return Self instead of overloaded types - Index.get_indexer accepts ndarray/list, not just Index - CategoricalIndex.remove_unused_categories missing from stubs - Series.where accepts broader argument types - ExtensionArray.astype accepts ExtensionDtype - Series[datetime].__setitem__ accepts np.nan (converts to NaT) - MultiIndex.rename accepts list of names 2. Added explicit type annotations to help mypy infer correct types: - coordinates.py: codes as list[np.ndarray] - dataset.py: arrays and extension_arrays list types - indexes.py: xr_index variable with PandasIndex | PandasMultiIndex 3. Removed redundant casts and fixed variable shadowing: - Removed unnecessary cast in remove_unused_levels_categories - Converted dict_keys to list for reorder_levels - Fixed test_backends.py variable naming (tdf -> tdf_series) 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com>
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fixes #10110 |
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Illviljan
reviewed
Jan 5, 2026
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(for transparency, I am fine if others want to refine this, but I am unlikely to do so... hope it's better to say this than just go dark...) |
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RTD failure looks unrelated. |
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Summary
Changes
Added type: ignore with explanations for:
CFTimeIndex.__add__/__radd__- return Self instead of pandas overloaded typesIndex.get_indexer- accepts ndarray/list, not just IndexCategoricalIndex.remove_unused_categories- missing from stubsSeries.where- accepts broader argument types than stubs allowExtensionArray.astype- accepts ExtensionDtypeSeries[datetime].__setitem__- accepts np.nan (converts to NaT)MultiIndex.rename- accepts list of namesAdded explicit type annotations:
coordinates.py: codes aslist[np.ndarray]dataset.py: arrays and extension_arrays list typesindexes.py: newxr_indexvariable withPandasIndex | PandasMultiIndextypeCleanup:
remove_unused_levels_categoriesreorder_levelstdf→tdf_series)Test plan
uv run dmypy runpasses with 0 errorspre-commit run --all-filespassesuv run pytest xarray -n auto- all tests pass🤖 Generated with Claude Code