Moshe Zadka: Networking for non-programmers (and a follow up), via Hans Nowak. A nice gently introduction to sockets, with example code using Python’s socket library.
This is Simple Python Sockets by Simon Willison, posted on 4th July 2003.
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Previously hosted at http://simon.incutio.com/archive/2003/07/04/simplyPythonSockets