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This looks like a good idea to me. It will help to clean up
the "get" method in Queue.py, which now has:

                while self._empty():
                    remaining = endtime - _time()
                    if remaining <= 0.0:
                        raise Empty
                    self.not_empty.wait(remaining)

Here, self.not_empty is an object of the class
threading.Condition. It seems odd that first we wait for
self.not_empty.wait to return, and then have to check
self._empty(), even though self.not_empty.wait could have
told us directly if it was notified or it timed out.

I'll write a message to python-dev in support of this patch
(I'm a mere patch reviewer, not an official Python developer).