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Consider this:
$ python
Python 2.7.4 (default, Apr 19 2013, 18:28:01) 
[GCC 4.7.3] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import multiprocessing as mp
>>> q = mp.Queue()
>>> while True:
 q.put(1)
 q.get_nowait()
Traceback (most recent call last):
 File "<stdin>", line 3, in <module>
 File "/usr/lib/python2.7/multiprocessing/queues.py", line 152, in get_nowait
 return self.get(False)
 File "/usr/lib/python2.7/multiprocessing/queues.py", line 134, in get
 raise Empty
Queue.Empty
I believe that similar behavior could be seen in cPython 2.7.3 with the Queue.Queue implementation, but I can't reproduce it now and don't have the old version to test. And it is irrelevant anyway since it work "correctly" now.
I think this behavior is counter intuitive and hampers the development of code that performs stuff with queues in a generic way and works in both single and multi-process environments.