def yaml(self):
        return yaml.dump(self.serialized, default_flow_style=False,
                         encoding=None)
def __init__(self, root, cwd, badfn=None, rules=[]):
        super(treematcher, self).__init__(root, cwd, badfn)
        rules = list(rules)
        self._matcher = pathmatcher.treematcher(rules)
        self._rules = rules