Python：在类中存储decorator？

Question

我的装饰器工作得很好，现在存储在一个模块中。如果可能的话，我想把它存储在类中，而不是与相关函数一起存放的地方。然而，我似乎无法让它工作，这是代码（没有不相关的部分）：

class MqPubSubFwdController(object):

    def __init__(self, address, port_pub, port_sub):

        self.mq_path_list = []
        self.mq_path_func = {}

    def handle_mq(self, mq_path, cmd=None):
        """ Decorator function.
            Registers the MQ path
        """
        def decorator(fn):
            key = "my_key"
            self.mq_path_list.append(prepostfix(mq_path).lower())
            self.mq_path_func[key] = fn

            def decorated(*args,**kwargs):
                return fn(*args,**kwargs)
            return decorated
        return decorator

@messaging.handle_mq('/mode/set','PUT')
def mq_mode_set(path=None, cmd=None, args=None, data=None):
    """ Set mode """
    print "A MODE WAS SET"
    return "A MODE WAS SET"

messaging = MqPubSubFwdController('localhost',1,2)

这将返回错误NameError:name'messaging'未在@decorator上定义。有没有办法让它工作，这样我就可以在类中调用decorator函数？我使用的是python2.7。你知道吗

Answer 1

就像阿兰菲说的，是关于地点的。 在引用类中的decorator函数之前，需要初始化该类。你知道吗

这是正确的代码：

class MqPubSubFwdController(object):

    def __init__(self, address, port_pub, port_sub):

        self.mq_path_list = []
        self.mq_path_func = {}

    def handle_mq(self, mq_path, cmd=None):
        """ Decorator function.
            Registers the MQ path
        """
        def decorator(fn):
            key = "my_key"
            self.mq_path_list.append(mq_path.lower())
            self.mq_path_func[key] = fn

            def decorated(*args,**kwargs):
                return fn(*args,**kwargs)
            return decorated
        return decorator

messaging = MqPubSubFwdController('localhost',1,2)

@messaging.handle_mq('/mode/set','PUT')
def mq_mode_set(path=None, cmd=None, args=None, data=None):
    """ Set mode """
    print "A MODE WAS SET"
    return "A MODE WAS SET"