Especially with all this static typing talk going on these days, a good set of documentation (with lots of useful examples) on interfaces and adaption would probably be eye-opening to a lot of people.
It took a lot of experimenting to figure out the PyProtocols package, and to just get my head around the usefulness/point of PEP 246, but now that I have, wow, I don't know how I lived without it.
Jay P.
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