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Code Listing by Jacob Hallen

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This recipe shows the easiest way of handling access to sockets, serial ports
and other asynchronous I/O ports while running a Tkinter based GUI.
It allows for a worker thread to block in a select(). Whenever something arrives
it will received and inserted in a queue. The main (GUI) thread then polls
the queue 10 times per second (often enough so the user will not notice any
significant delay), and processes all...