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bpo-33134: dataclasses: use function dispatch table for hash, instead of a string lookup which then is tested with if tests. (GH-6222)

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* Change _hash_action to be a function table lookup, instead of a list
of strings which is then tested with if statements.
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Eric V. Smith 2018-03-24 22:10:14 -04:00 • committed by GitHub
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When computing dataclass's __hash__, use the lookup table to contain the
function which returns the __hash__ value. This is an improvement over
looking up a string, and then testing that string to see what to do.