On Thu, Oct 17, 2013 at 11:54 AM, Ben Finney <[email protected]>wrote:

> Since the correct behaviour is ambiguous, Python refuses the temptation
> to guess. I
>

Your definition of + would have to be non-commutative, because & and
removing clashing values is a subtraction (sensitive to the order). So it's
a bad "addition" in two ways.


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