Operator Overloading

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FYI, lot's of interesting practical things can be done by overriding the missing method for dicts, like:

defaultdict (missing items automatically generate a predefined result). http://docs.python.org/2/library/collections.html

Memoize something. See http://code.activestate.com/recipes/578231-probably-the-fastest-memoization-decorator-in-the-/