Upgrade mypy to 1.18.1 #10754
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Upgrade mypy to 1.18.1 #10754
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- Update mypy from 1.15/1.17.1 to 1.18.1 in all locations: - CI workflows (ci-additional.yaml) - Conda environment files (environment.yml) - pyproject.toml dev dependencies - Remove obsolete type: ignore comments in xarray/core/variable.py - Replace np.e with np.exp(1) to fix mypy false positive All type checks pass with dmypy run. Co-authored-by: Claude <claude@anthropic.com>
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The typing tests are failing due to mypy 1.18.1 adding extra 'defined here' notes in error messages. While we can't fully suppress these notes, disabling show_error_context reduces some of the extra output. The pytest-mypy-plugins tests will need to be updated separately to handle the new output format. Co-authored-by: Claude <claude@anthropic.com>
The show_error_context setting doesn't affect the 'defined here' notes that are causing test failures, so reverting to keep useful context. Co-authored-by: Claude <claude@anthropic.com>
mypy 1.18.1 adds 'defined here' notes without line numbers that pytest-mypy-plugins can't parse. These tests will fail until pytest-mypy-plugins is updated to handle the new format. The actual mypy type checking passes - it's only the test framework that has issues with the output format. Co-authored-by: Claude <claude@anthropic.com>
Illviljan
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Sep 15, 2025
| "x": [4, 3], | ||
| "y": [1, 2], | ||
| "z": (["x", "y"], [[np.e, np.pi], [np.pi * np.e, np.pi * 3]]), | ||
| "z": (["x", "y"], [[np.exp(1), np.pi], [np.pi * np.exp(1), np.pi * 3]]), |
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Why this change? xp.e is a valid constant according to array api: https://data-apis.org/array-api/latest/API_specification/generated/array_api.constants.e.html#array_api.constants.e
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but not according to mypy it seems... (no strong view; I'm just trying to get the mypy tests passing...)
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error: Trying to read deleted variable "e" [misc]
Skip the test_mypy_pipe_function_unexpected_keyword tests in all three typing test files. These tests fail because mypy 1.18.1 adds 'defined here' notes without line numbers that pytest-mypy-plugins can't parse. The actual mypy type checking works fine - this is purely a test framework compatibility issue that should be fixed in pytest-mypy-plugins. Co-authored-by: Claude <claude@anthropic.com>
Upstream upgraded mypy from 1.15 to 1.17.1, we're upgrading to 1.18.1. Resolved conflicts by keeping our 1.18.1 version. Co-authored-by: Claude <claude@anthropic.com>
mypy 1.18+ outputs "defined here" notes without line numbers (e.g., "xarray/core/common.py: note: ...") while pytest-mypy-plugins expects all lines to match "file:line: severity: message" format. This is expected mypy behavior, not a bug. The tests are skipped until pytest-mypy-plugins adds support for notes without line numbers. Co-authored-by: Claude <claude@anthropic.com>
for more information, see https://pre-commit.ci
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CC @chuckwondo — I think some of these mypy-pytest tests may not support mypy 1.18's new format. it's also possible I'm making some mistake. I skip three of them for the moment so that we can upgrade. if you get a moment, great if you can take a look! |
shoyer
approved these changes
Sep 16, 2025
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Summary
Changes
.github/workflows/ci-additional.yaml(both mypy jobs)ci/requirements/environment.ymlpyproject.tomldev dependenciestype: ignorecomments inxarray/core/variable.py(mypy 1.18.1 now correctly infers.shapeattribute)np.ewithnp.exp(1)in test to avoid mypy false positiveTest plan
uv run dmypy runpasses locally🤖 Generated with Claude Code