types(power_sort): preserve input item type - #15488
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cclauss merged 4 commits intoOct 5, 2026
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10 errors, 6 warnings, and 1 notice
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Run uv run --python 3.15 --with ty ty check --output-format=github --exit-zero:
scripts/validate_solutions.py#L34
scripts/validate_solutions.py:34:5: unresolved-attribute: Attribute `exec_module` is not defined on `None` in union `Loader | None`
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Run uv run --python 3.15 --with ty ty check --output-format=github --exit-zero:
scripts/validate_solutions.py#L33
scripts/validate_solutions.py:33:46: invalid-argument-type: Argument to function `module_from_spec` is incorrect: Expected `ModuleSpec`, found `ModuleSpec | None`
info: element `None` of union `ModuleSpec | None` is not assignable to `ModuleSpec`
stdlib/_frozen_importlib.pyi:45:5: info: Function defined here
stdlib/_frozen_importlib.pyi:45:22: Parameter declared here
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Run uv run --python 3.15 --with ty ty check --output-format=github --exit-zero:
scripts/validate_solutions.py#L19
scripts/validate_solutions.py:19:8: unresolved-import: Cannot resolve imported module `pytest`
info: Searched in the following paths during module resolution:
info: 1. vendored://stdlib (stdlib typeshed stubs vendored by ty)
info: 2. /home/runner/work/_temp/setup-uv-cache/builds-v0/.tmp55633P/lib/python3.15/site-packages (site-packages)
info: 3. /home/runner/work/_temp/setup-uv-cache/builds-v0/.tmp55633P/lib64/python3.15/site-packages (site-packages)
info: 4. /home/runner/work/Python/Python/.venv/lib/python3.15/site-packages (site-packages)
info: 5. /home/runner/work/Python/Python/.venv/lib64/python3.15/site-packages (site-packages)
info: make sure your Python environment is properly configured: https://docs.astral.sh/ty/modules/#python-environment
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Run uv run --python 3.15 --with ty ty check --output-format=github --exit-zero:
other/dancing_links.py#L69
other/dancing_links.py:69:17: invalid-assignment: Object of type `DLXNode` is not assignable to attribute `up` of type `ColumnNode`
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Run uv run --python 3.15 --with ty ty check --output-format=github --exit-zero:
other/dancing_links.py#L68
other/dancing_links.py:68:17: invalid-assignment: Object of type `DLXNode` is not assignable to attribute `down` of type `ColumnNode`
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Run uv run --python 3.15 --with ty ty check --output-format=github --exit-zero:
maths/test_factorial.py#L10
maths/test_factorial.py:10:6: unresolved-import: Cannot resolve imported module `maths.factorial`
info: Searched in the following paths during module resolution:
info: 1. vendored://stdlib (stdlib typeshed stubs vendored by ty)
info: 2. /home/runner/work/_temp/setup-uv-cache/builds-v0/.tmp55633P/lib/python3.15/site-packages (site-packages)
info: 3. /home/runner/work/_temp/setup-uv-cache/builds-v0/.tmp55633P/lib64/python3.15/site-packages (site-packages)
info: 4. /home/runner/work/Python/Python/.venv/lib/python3.15/site-packages (site-packages)
info: 5. /home/runner/work/Python/Python/.venv/lib64/python3.15/site-packages (site-packages)
info: make sure your Python environment is properly configured: https://docs.astral.sh/ty/modules/#python-environment
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Run uv run --python 3.15 --with ty ty check --output-format=github --exit-zero:
maths/test_factorial.py#L8
maths/test_factorial.py:8:8: unresolved-import: Cannot resolve imported module `pytest`
info: Searched in the following paths during module resolution:
info: 1. vendored://stdlib (stdlib typeshed stubs vendored by ty)
info: 2. /home/runner/work/_temp/setup-uv-cache/builds-v0/.tmp55633P/lib/python3.15/site-packages (site-packages)
info: 3. /home/runner/work/_temp/setup-uv-cache/builds-v0/.tmp55633P/lib64/python3.15/site-packages (site-packages)
info: 4. /home/runner/work/Python/Python/.venv/lib/python3.15/site-packages (site-packages)
info: 5. /home/runner/work/Python/Python/.venv/lib64/python3.15/site-packages (site-packages)
info: make sure your Python environment is properly configured: https://docs.astral.sh/ty/modules/#python-environment
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Run uv run --python 3.15 --with ty ty check --output-format=github --exit-zero:
maths/test_abs.py#L10
maths/test_abs.py:10:6: unresolved-import: Cannot resolve imported module `maths.abs`
info: Searched in the following paths during module resolution:
info: 1. vendored://stdlib (stdlib typeshed stubs vendored by ty)
info: 2. /home/runner/work/_temp/setup-uv-cache/builds-v0/.tmp55633P/lib/python3.15/site-packages (site-packages)
info: 3. /home/runner/work/_temp/setup-uv-cache/builds-v0/.tmp55633P/lib64/python3.15/site-packages (site-packages)
info: 4. /home/runner/work/Python/Python/.venv/lib/python3.15/site-packages (site-packages)
info: 5. /home/runner/work/Python/Python/.venv/lib64/python3.15/site-packages (site-packages)
info: make sure your Python environment is properly configured: https://docs.astral.sh/ty/modules/#python-environment
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Run uv run --python 3.15 --with ty ty check --output-format=github --exit-zero:
maths/test_abs.py#L8
maths/test_abs.py:8:8: unresolved-import: Cannot resolve imported module `pytest`
info: Searched in the following paths during module resolution:
info: 1. vendored://stdlib (stdlib typeshed stubs vendored by ty)
info: 2. /home/runner/work/_temp/setup-uv-cache/builds-v0/.tmp55633P/lib/python3.15/site-packages (site-packages)
info: 3. /home/runner/work/_temp/setup-uv-cache/builds-v0/.tmp55633P/lib64/python3.15/site-packages (site-packages)
info: 4. /home/runner/work/Python/Python/.venv/lib/python3.15/site-packages (site-packages)
info: 5. /home/runner/work/Python/Python/.venv/lib64/python3.15/site-packages (site-packages)
info: make sure your Python environment is properly configured: https://docs.astral.sh/ty/modules/#python-environment
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Run uv run --python 3.15 --with ty ty check --output-format=github --exit-zero:
computer_vision/mean_threshold.py#L24
computer_vision/mean_threshold.py:24:13: invalid-assignment: Cannot assign to a subscript on an object of type `None`
info: The full type of the subscripted object is `PixelAccess | None`
info: `None` does not have a `__setitem__` method.
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Run uv run --python 3.15 --with ty ty check --output-format=github --exit-zero:
web_programming/current_weather.py#L33
web_programming/current_weather.py:33:8: redundant-condition: Object of type `Literal[""]` is always falsy
web_programming/current_weather.py:34:9: This statement is unreachable
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Run uv run --python 3.15 --with ty ty check --output-format=github --exit-zero:
web_programming/current_weather.py#L27
web_programming/current_weather.py:27:8: redundant-condition: Object of type `Literal[""]` is always falsy
web_programming/current_weather.py:28:9: This statement is unreachable
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Run uv run --python 3.15 --with ty ty check --output-format=github --exit-zero:
matrix/matrix_operation.py#L44
matrix/matrix_operation.py:44:13: redundant-condition: Expression `_verify_matrix_sizes(matrix_a, matrix_b)` is always truthy (has type `tuple[tuple[int, int], tuple[int, int]]`)
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Run uv run --python 3.15 --with ty ty check --output-format=github --exit-zero:
machine_learning/dimensionality_reduction.py#L146
machine_learning/dimensionality_reduction.py:146:8: redundant-condition: Method `ndarray.any` is always truthy: Did you mean to call this method?
machine_learning/dimensionality_reduction.py:158:5: This following branch is unreachable
help: Replace with `features.any(...)`
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Run uv run --python 3.15 --with ty ty check --output-format=github --exit-zero:
divide_and_conquer/convex_hull.py#L120
divide_and_conquer/convex_hull.py:120:8: truthiness-test-of-iterable: Variable `list_of_tuples` might be truthy even if its length is 0 (has type `list[Point] | Iterable[list[float]]`)
divide_and_conquer/convex_hull.py:89:21: Inferred as `list[Point] | Iterable[list[float]]` due to this annotation
info: `list[Point] | Iterable[list[float]]` objects can be generators, and generators are truthy even when empty
help: Test the length of the iterable instead of its truthiness
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Run uv run --python 3.15 --with ty ty check --output-format=github --exit-zero:
data_structures/linked_list/print_reverse.py#L102
data_structures/linked_list/print_reverse.py:102:12: truthiness-test-of-iterable: Variable `elements_list` might be truthy even if its length is 0 (has type `Iterable[int]`)
data_structures/linked_list/print_reverse.py:88:37: Inferred as `Iterable[int]` due to this annotation
info: `Iterable[int]` objects can be generators, and generators are truthy even when empty
help: Use `collections.abc.Collection[int]` as the annotation on line 88
info: A `Collection` must define `__len__`, so `Collection` excludes generators
help: Alternatively, test the length of the iterable instead of its truthiness
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"The ubuntu-latest label will migrate to Ubuntu 26 beginning October 19, 2026. For more information, see https://github.com/actions/runner-images/issues/14748"
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