boolean xor

[Aahz Maruch]

I need a boolean (not bit-wise) xor function.  I've got the following
function, but my logic skills are rusty enough that I'm wondering if
this is the "right" way to do it (I've validated that it produces the
correct outputs, at least):

def xor(a,b):
    return not ( (a and b) or (not (a or b)) )
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