[Twisted-Python] 9.0.0 question

exarkun at twistedmatrix.com exarkun at twistedmatrix.com
Thu Jan 21 03:58:42 EST 2010

On 03:43 am, glyph at twistedmatrix.com wrote:
>On Jan 20, 2010, at 3:20 PM, Mikhail Terekhov wrote:
>>I've switched recently from 8.2 to 9.0 and noticed that some of my
>>client scripts
>>hang in reactor.stop() on exit sometimes. That never happened before. 
>>example if I run the gethostbyname.py from the twisted-names examples 
>>it prints the correct result and hangs forever until I press Cntrl-C.
>>Then it prints the
>>following traceback:
>I don't see the behavior you describe, but I do see this traceback on 
>trunk with every 3rd run or so of that example - maybe the example is 
>doc/names/examples$ python gethostbyname.py  twistedmatrix.com
>twisted/names/dns.py:1670: DeprecationWarning: Please only pass IPs to 
>write(), not hostnames
>  self.transport.write(message.toStr(), address)
>Traceback (most recent call last):
>  File "twisted/internet/udp.py", line 121, in doRead
>    self.protocol.datagramReceived(data, addr)
>  File "twisted/names/dns.py", line 1700, in datagramReceived
>    d.callback(m)
>  File "twisted/internet/defer.py", line 239, in callback
>    self._startRunCallbacks(result)
>  File "twisted/internet/defer.py", line 308, in _startRunCallbacks
>    self._runCallbacks()
>--- <exception caught here> ---
>  File "twisted/internet/defer.py", line 324, in _runCallbacks
>    self.result = callback(self.result, *args, **kw)
>  File "twisted/names/common.py", line 239, in <lambda>
>    ).addBoth(lambda passthrough: (r.protocol.transport.stopListening(), 
>exceptions.AttributeError: 'NoneType' object has no attribute 


>Can you provide a simpler, more streamlined example of the problem 
>you're describing?
>Twisted-Python mailing list
>Twisted-Python at twistedmatrix.com

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