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18k4Auto differentiationPython / autodifferentiation, calculus, descent, gradient, math, optimization, vector / by Raymond Hettinger (7 years ago, revision 5)
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31k4Nested contexts -- a chain of mapping objectsPython / ast, chained, compiler, dictionary, inheritance, nested, nonlocal, scopes, xml / by Raymond Hettinger (13 years ago, revision 2)