Delete a file or a directory

def action_rename(self, courseid, taskid, path, new_path):
        """ Delete a file or a directory """
        # normalize
        path = path.strip()
        new_path = new_path.strip()
        if not path.startswith("/"):
            path = "/" + path
        if not new_path.startswith("/"):
            new_path = "/" + new_path

        old_path = self.verify_path(courseid, taskid, path)
        if old_path is None:
            return self.show_tab_file(courseid, taskid, _("Internal error"))

        wanted_path = self.verify_path(courseid, taskid, new_path, True)
        if wanted_path is None:
            return self.show_tab_file(courseid, taskid, _("Invalid new path"))

        try:
            self.task_factory.get_task_fs(courseid, taskid).move(old_path, wanted_path)
            return self.show_tab_file(courseid, taskid)
        except:
            return self.show_tab_file(courseid, taskid, _("An error occurred while moving the files"))