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ruff check --fix --unsafe-fixes
literal-membership (PLR6201)
Derived from the Pylint linter.
Fix is always available.
This rule is in preview and is not stable. The
--preview
flag is required for use.What it does
Checks for membership tests on
list
andtuple
literals.Why is this bad?
When testing for membership in a static sequence, prefer a
set
literalover a
list
ortuple
, as Python optimizesset
membership tests.Example
Use instead:
Fix safety
This rule's fix is marked as unsafe, as the use of a
set
literal willerror at runtime if the sequence contains unhashable elements (like lists
or dictionaries). While Ruff will attempt to infer the hashability of the
elements, it may not always be able to do so.
References
What’s New In Python 3.2
PR title captures the intent of the changes, and is fitting for release notes.
Added appropriate release note label
Commit history is consistent and clean, in line with the contribution guidelines.
Make sure unit tests pass locally after every commit (
git rebase -i main --exec 'pytest tests/ert/unit_tests -n logical -m "not integration_test"'
)When applicable