Python 使用MSN协议运行twisted.words示例时出现异常

我正在运行twisted.words MSN协议示例，该示例来自twisted文档，位于此处：

但是，当我运行此示例脚本时，会出现未处理的错误异常：

2012-05-12 15:39:51-0300 [-] Log opened.
2012-05-12 15:39:51-0300 [-] Starting factory <twisted.internet.protocol.ClientFactory instance at  0x8c6c18c>
2012-05-12 15:39:52-0300 [Dispatch,client] Starting factory <twisted.words.protocols.msn.NotificationFactory instance at 0x8c6c2cc>
2012-05-12 15:39:52-0300 [Dispatch,client] Stopping factory <twisted.internet.protocol.ClientFactory instance at 0x8c6c18c>
2012-05-12 15:39:53-0300 [Notification,client] Starting factory <twisted.internet.protocol.ClientFactory instance at 0x8c710ec>
2012-05-12 15:39:53-0300 [Notification,client] Unhandled Error
Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/twisted/python/log.py", line 84, in callWithLogger
    return callWithContext({"system": lp}, func, *args, **kw)
  File "/usr/lib/python2.7/dist-packages/twisted/python/log.py", line 69, in callWithContext
    return context.call({ILogContext: newCtx}, func, *args, **kw)
  File "/usr/lib/python2.7/dist-packages/twisted/python/context.py", line 118, in callWithContext
    return self.currentContext().callWithContext(ctx, func, *args, **kw)
  File "/usr/lib/python2.7/dist-packages/twisted/python/context.py", line 81, in callWithContext
    return func(*args,**kw)
--- <exception caught here> ---
  File "/usr/lib/python2.7/dist-packages/twisted/internet/selectreactor.py", line 146, in _doReadOrWrite
    why = getattr(selectable, method)()
  File "/usr/lib/python2.7/dist-packages/twisted/internet/tcp.py", line 460, in doRead
    rval = self.protocol.dataReceived(data)
  File "/usr/lib/python2.7/dist-packages/twisted/protocols/basic.py", line 564, in dataReceived
    why = self.lineReceived(line)
  File "/usr/lib/python2.7/dist-packages/twisted/words/protocols/msn.py", line 670, in lineReceived
    handler(params.split())
  File "/usr/lib/python2.7/dist-packages/twisted/words/protocols/msn.py", line 848, in handle_USR
    authData=params[3])
  File "/usr/lib/python2.7/dist-packages/twisted/internet/defer.py", line 108, in execute
    return succeed(result)
  File "/usr/lib/python2.7/dist-packages/twisted/internet/defer.py", line 71, in succeed
    d.callback(result)
  File "/usr/lib/python2.7/dist-packages/twisted/internet/defer.py", line 360, in callback
    assert not isinstance(result, Deferred)
exceptions.AssertionError: 

2012-05-12 15:39:53-0300 [Notification,client] Stopping factory <twisted.words.protocols.msn.NotificationFactory instance at 0x8c6c2cc>
2012-05-12 15:39:55-0300 [PassportNexus,client] Starting factory <twisted.internet.protocol.ClientFactory instance at 0x8d014cc>
2012-05-12 15:39:55-0300 [PassportNexus,client] Stopping factory <twisted.internet.protocol.ClientFactory instance at 0x8c710ec>
2012-05-12 15:39:56-0300 [PassportLogin,client] Stopping factory <twisted.internet.protocol.ClientFactory instance at 0x8d014cc>

2012-05-12 15:39:51-0300[-]日志已打开。
2012-05-12 15:39:51-0300[-]启动工厂
2012-05-12 15:39:52-0300[调度，客户]启动工厂
2012-05-12 15:39:52-0300[调度，客户]停止工厂
2012-05-12 15:39:53-0300[通知，客户]开始工厂
2012-05-12 15:39:53-0300[通知，客户]未处理的错误
回溯（最近一次呼叫最后一次）：
callWithLogger中的文件“/usr/lib/python2.7/dist packages/twisted/python/log.py”，第84行
返回callWithContext（{“system”：lp}，func，*args，**kw）
callWithContext中的文件“/usr/lib/python2.7/dist packages/twisted/python/log.py”，第69行
返回context.call（{ILogContext:newCtx}，func，*args，**kw）
callWithContext中的文件“/usr/lib/python2.7/dist packages/twisted/python/context.py”，第118行
返回self.currentContext（）.callWithContext（ctx，func，*args，**kw）
callWithContext中的文件“/usr/lib/python2.7/dist packages/twisted/python/context.py”，第81行
返回函数（*参数，**kw）
---  ---
文件“/usr/lib/python2.7/dist-packages/twisted/internet/selectreactor.py”，第146行，in_-doReadOrWrite
为什么=getattr（可选，方法）（）
文件“/usr/lib/python2.7/dist-packages/twisted/internet/tcp.py”，第460行，在doRead中
rval=self.protocol.dataReceived（数据）
dataReceived中的文件“/usr/lib/python2.7/dist packages/twisted/protocols/basic.py”，第564行
为什么=self.lineReceived（行）
文件“/usr/lib/python2.7/dist-packages/twisted/words/protocols/msn.py”，第670行，在lineReceived中
处理程序（params.split（））
文件“/usr/lib/python2.7/dist packages/twisted/words/protocols/msn.py”，第848行，在handle_usr中
authData=params[3]）
文件“/usr/lib/python2.7/dist packages/twisted/internet/defer.py”，执行中的第108行
返回成功（结果）
文件“/usr/lib/python2.7/dist-packages/twisted/internet/defer.py”，第71行
d、 回调（结果）
文件“/usr/lib/python2.7/dist-packages/twisted/internet/defer.py”，第360行，在回调中
断言不存在（结果，延迟）
异常。断言错误：
2012-05-12 15:39:53-0300[通知，客户]停止工厂
2012-05-12 15:39:55-0300[PassportNexus，客户]启动工厂
2012-05-12 15:39:55-0300[PassportNexus，客户]停止工厂
2012-05-12 15:39:56-0300[密码登录，客户端]停止工厂

• Python 2.7.2+
• 扭曲11.0.0
• pyopenssl0.12

---

我以前从未使用过t.w.protocols.msn协议，但在我看来，Twisted的

msn.py

中似乎有一个bug。下面是有问题的函数：

def handle_USR(self, params):
    if len(params) != 4 and len(params) != 6:
        raise MSNProtocolError, "Invalid Number of Parameters for USR"

    mechanism = params[1]
    if mechanism == "OK":
        self.loggedIn(params[2], unquote(params[3]), int(params[4]))
    elif params[2].upper() == "S":
        # we need to obtain auth from a passport server
        f = self.factory
        d = execute(                                                   # <------- here
            _login, f.userHandle, f.password, f.passportServer,
            authData=params[3])
        d.addCallback(self._passportLogin)
        d.addErrback(self._passportError)

def handle_USR（self，params）：
如果len（params）！=4和len（参数）！=6:
引发MSNProtocolError，“USR的参数数无效”
机制=参数[1]
如果机制==“正常”：
self.loggedIn（参数[2]，unquote（参数[3]），int（参数[4]））
elif参数[2]。上限（）=“S”：
#我们需要从passport服务器获取身份验证
f=自组装工厂
d=执行（#