[issue20632] Define a new __key__ protocol

[Antoine Pitrou]

Antoine Pitrou added the comment:

This is a very nice idea, but does it have to be part of the interpreter core, or could it simply be supplied by a decorator in the functools module?

(the main advantage of having it in the interpreter is speed)

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nosy: +pitrou

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<http://bugs.python.org/issue20632>
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