BUG: unreferenced variable.

    5754e615 (Frederic Bastien  2013-02-06 17:08:51 -0500  944)                     if not os.path.exists(location):
    5754e615 (Frederic Bastien  2013-02-06 17:08:51 -0500  945)                         # Temporary fix, we should make sure it don't
    5754e615 (Frederic Bastien  2013-02-06 17:08:51 -0500  946)                         # get deleted by the clear*() fct.
    5754e615 (Frederic Bastien  2013-02-06 17:08:51 -0500  947)                         os.makedirs(path)

@nouiz :)

This is something that was unlikely to be caught by a test, but something that is easily detected with pyflakes. @nouiz you use emacs; maybe [these instructions](http://reinout.vanrees.org/weblog/2010/05/11/pep8-pyflakes-emacs.html) would help you set it up to catch it automatically in your editor?