Hello,
there are two patches in Launchpad that I plan to merge within few days.
"import fu; del fu complains about RedefinedWhileUnused" https://bugs.launchpad.net/pyflakes/+bug/1162161 https://github.com/pyflakes/pyflakes/pull/4
"ignore special locals of test frameworks" https://bugs.launchpad.net/pyflakes/+bug/1105525 https://github.com/pyflakes/pyflakes/pull/5
If you are interested, you can review these issues and comment.