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OS: SELECT(2), POLL(2), and their variants


URL Parameters / URL Query / Tornado get_argument()


Closest Pair of Points


Python: Socket Programming 101


A socket is like an endpoint... or a line segment


Python: synchronization primitives


Python: sharing states between processes


Middleman Patterns: Adapter / Proxy / Decorator


Visitor Pattern Revisited


What does context-free mean in CFLs?