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Not quite sure this is a bug, but the problem caused me 
considerable time to track down (Python 2.3.2 on Solaris).
assume proxy is a variable for a server proxy created with
xmlrpclib.Server(), but sometimes it is None (assume a
default argument to a function).
The comparisons
if proxy != None:
or
if proxy:
fail with (to me) rather incomprehensible error messages.
However, the test
if proxy is not None:
does what I expect.
Is this a feature or a bug?
Thanks a lot for looking into it.
Andreas Eisele

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I also encountered the same bug. It appears that the
ServerProxy class does not implement the necessary operator
methods and therefore the defined __getattr__ method takes
over and gets it wrong. 
Adding the following methods to ServerProxy resolves the issue:
 def __eq__(self, other):
 return self is other
 
 def __ne__(self, other):
 return self is not other
 
 def __nonzero__(self):
 return True
It would be great, if this could be fixed in xmlrpclib.
Thanks,
 Gerhard Reitmayr

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Note that comparisons to None are better written as 'if
proxy is not None'; they're faster that way.
There's a more general problem here: any Python special
methods are forwarded via XML-RPC, so if you write 'proxy +
5', it tries to call __coerce__ and fails; if you write
'proxy[5]', it calls __getitem__ and fails.
One fix would be to implement all of these methods on
ServerProxy. Another would be to ignore methods beginning
and ending with '__' in the __getattr__, but then you
couldn't call such methods at all. 
I suggest that there's really nothing to do here; if you try
certain operations on a ServerProxy, they'll fail. Closing
as "won't fix".