redefined-while-unused (F811)

Derived from the Pyflakes linter.

What it does

Checks for variable definitions that redefine (or "shadow") unused variables.

Why is this bad?

Redefinitions of unused names are unnecessary and often indicative of a mistake.

Example

import foo
import bar
import foo  # Redefinition of unused `foo` from line 1

Use instead:

import foo
import bar