Derived from the Pyflakes linter.
Fix is sometimes available.
What it does#
Checks for the presence of unused variables in function scopes.
Why is this bad?#
A variable that is defined but not used is likely a mistake, and should be removed to avoid confusion.
If a variable is intentionally defined-but-not-used, it should be
prefixed with an underscore, or some other value that adheres to the
Under preview mode, this rule also
triggers on unused unpacked assignments (for example,
x, y = foo()).