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[CI][Dev][Python] cython-lint fails with AttributeError for DictComprehensionAppendNode #50985

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Description

@hiroyuki-sato

Describe the bug, including details regarding any error messages, version, and platform.

Python (Cython) Lint failed.
https://github.com/apache/arrow/actions/runs/32839428780/job/97775436998?pr=50935#step:5:69

Python (Cython) Lint.....................................................Failed
- hook id: cython-lint
- exit code: 1

Traceback (most recent call last):
  File "/home/runner/.cache/pre-commit/repoohugd5tn/py_env-python3/bin/cython-lint", line 8, in <module>
    sys.exit(main())
             ^^^^^^
  File "/home/runner/.cache/pre-commit/repoohugd5tn/py_env-python3/lib/python3.12/site-packages/cython_lint/cython_lint.py", line 960, in main
    ret |= _main(
           ^^^^^^
  File "/home/runner/.cache/pre-commit/repoohugd5tn/py_env-python3/lib/python3.12/site-packages/cython_lint/cython_lint.py", line 837, in _main
    lines = run_ast_checks(code, filename, violations)
            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/runner/.cache/pre-commit/repoohugd5tn/py_env-python3/lib/python3.12/site-packages/cython_lint/cython_lint.py", line 751, in run_ast_checks
    names, imported_names, global_names, exported_imports = _traverse_file(
                                                            ^^^^^^^^^^^^^^^
  File "/home/runner/.cache/pre-commit/repoohugd5tn/py_env-python3/lib/python3.12/site-packages/cython_lint/cython_lint.py", line 541, in _traverse_file
    expr = node.loop.body.value_expr
           ^^^^^^^^^^^^^^^^^^^^^^^^^
AttributeError: 'DictComprehensionAppendNode' object has no attribute 'value_expr'
Traceback (most recent call last):
  File "/home/runner/.cache/pre-commit/repoohugd5tn/py_env-python3/bin/cython-lint", line 8, in <module>
    sys.exit(main())
             ^^^^^^
  File "/home/runner/.cache/pre-commit/repoohugd5tn/py_env-python3/lib/python3.12/site-packages/cython_lint/cython_lint.py", line 960, in main
    ret |= _main(
           ^^^^^^
  File "/home/runner/.cache/pre-commit/repoohugd5tn/py_env-python3/lib/python3.12/site-packages/cython_lint/cython_lint.py", line 837, in _main
    lines = run_ast_checks(code, filename, violations)
            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/runner/.cache/pre-commit/repoohugd5tn/py_env-python3/lib/python3.12/site-packages/cython_lint/cython_lint.py", line 751, in run_ast_checks
    names, imported_names, global_names, exported_imports = _traverse_file(
                                                            ^^^^^^^^^^^^^^^
  File "/home/runner/.cache/pre-commit/repoohugd5tn/py_env-python3/lib/python3.12/site-packages/cython_lint/cython_lint.py", line 541, in _traverse_file
    expr = node.loop.body.value_expr
           ^^^^^^^^^^^^^^^^^^^^^^^^^
AttributeError: 'DictComprehensionAppendNode' object has no attribute 'value_expr'

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Activity

  1. added a commit that references this issue on Aug 25, 2026
  2. added this to the 26.0.0 milestone on Aug 25, 2026
  3. rok commented on Aug 25, 2026

    @rok
    Member

    Issue resolved by pull request 50986
    #50986

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