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by Jan Schneider.
Original Post: Advanced Python network programming
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Understanding Network I/O, Part 2 by George Belotsky (via The Farm) is the best tutorial on the subject of network programming I've seen yet. It provides a detailed explanation of simple threaded network clients, thread pools using the Queue module and asynchronous I/O using both Twisted and Python's asyncore library - then discusses the strengths and weaknesses of each approach.