使用msn协议运行twisted.words示例的问题

Question

我目前正在尝试使用Twisted库专门扭曲的单词来尝试与MSN进行交互.但是当我运行twisted提供的示例脚本时,我收到错误.具体来说,错误可以在这里找到http://i42.tinypic.com/wl945w.jpg.该脚本可以在http://twistedmatrix.com/projects/words/documentation/examples/msn_example.py找到.

平台是使用Python 2.6的Vista

编辑:完整输出:

Email (passport): mypassport@hotmail.com
Password: ******
2009-04-25 10:52:49-0300 [-] Log opened.
2009-04-25 10:52:49-0300 [-] Starting factory <twisted.internet.protocol.ClientFactory instance at 0x9d87e8c>
2009-04-25 10:52:55-0300 [Dispatch,client] Starting factory <twisted.words.protocols.msn.NotificationFactory instance at 0x9e28bcc>
2009-04-25 10:52:55-0300 [Dispatch,client] Stopping factory <twisted.internet.protocol.ClientFactory instance at 0x9d87e8c>
2009-04-25 10:52:55-0300 [Notification,client] Unhandled Error
    Traceback (most recent call last):
      File "/usr/local/lib/python2.5/site-packages/twisted/python/log.py", line 84, in callWithLogger
        return callWithContext({"system": lp}, func, *args, **kw)
      File "/usr/local/lib/python2.5/site-packages/twisted/python/log.py", line 69, in callWithContext
        return context.call({ILogContext: newCtx}, func, *args, **kw)
      File "/usr/local/lib/python2.5/site-packages/twisted/python/context.py", line 59, in callWithContext
        return self.currentContext().callWithContext(ctx, func, *args, **kw)
      File "/usr/local/lib/python2.5/site-packages/twisted/python/context.py", line 37, in callWithContext
        return func(*args,**kw)
    --- <exception caught here> ---
      File "/usr/local/lib/python2.5/site-packages/twisted/internet/selectreactor.py", line 146, in _doReadOrWrite
        why = getattr(selectable, method)()
      File "/usr/local/lib/python2.5/site-packages/twisted/internet/tcp.py", line 460, in doRead
        return self.protocol.dataReceived(data)
      File "/usr/local/lib/python2.5/site-packages/twisted/protocols/basic.py", line 238, in dataReceived
        why = self.lineReceived(line)
      File "/usr/local/lib/python2.5/site-packages/twisted/words/protocols/msn.py", line 651, in lineReceived
        handler(params.split())
      File "/usr/local/lib/python2.5/site-packages/twisted/words/protocols/msn.py", line 827, in handle_USR
        d = _login(f.userHandle, f.password, f.passportServer, authData=params[3])
      File "/usr/local/lib/python2.5/site-packages/twisted/words/protocols/msn.py", line 182, in _login
        reactor.connectSSL(_parsePrimitiveHost(nexusServer)[0], 443, fac, ClientContextFactory())
    exceptions.TypeError: 'NoneType' object is not callable

2009-04-25 10:52:55-0300 [Notification,client] Stopping factory <twisted.words.protocols.msn.NotificationFactory instance at 0x9e28bcc>

Answer 1

发生了什么

当您尝试调用 None 对象时会出现此异常。看一下这个 ：

>>> a = str
>>> a() # it's ok, a string is a callable class
''
>>> a = None
>>> a() # it fails, None a special Singleton not meant to be called

Traceback (most recent call last):
  File "<pyshell#4>", line 1, in <module>
    a()
TypeError: 'NoneType' object is not callable

你可以做什么

你不能这样猜测，所以你需要进行一些调试。

显然，最后一行（refactor.connectSSL ...）包含三个对象调用，其中一个对象是 None 。

如果您不喜欢调试器，您可以做的第一件事是获取该行的每个元素并在其之前添加：

assert object1 is None 
assert object2 is None

然后你就会得到异常的来源。然后检查一下为什么这个对象被设置为None。您可能需要检查文档以了解在哪种情况下某些可能已初始化它的方法返回 None 。

愿力量...