Because of multithreading semantics, this is not reliable.

[OlafMeding at gmail.com]

Tim and Grant

>>>
     if q.empty():
         return
>>>

Of course you explanation is understood and ideally should be included
as a note in the Python documentation.  And the "not reliable" should
be removed from the documentation!

Anyway, many thanks for your explanations (I feel "safer" now).

Olaf