unused-variable (F841)
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
lint.dummy-variable-rgx
pattern.
Example
Use instead:
Fix safety
This rule's fix is marked as unsafe because removing an unused variable assignment may delete comments that are attached to the assignment.
See also
This rule does not apply to bindings in unpacked assignments (e.g. x, y = 1, 2
). See
unused-unpacked-variable
for this case.