def cleanup():
        """Delete standard installation directories."""
        for install_dir in linters.INSTALL_DIRS:
            try:
                shutil.rmtree(install_dir, ignore_errors=True)
            except Exception:
                print(
                    "{0}\nFailed to delete {1}".format(
                        traceback.format_exc(), install_dir
                    )
                )
                sys.stdout.flush()