If X and Y are sets, then the __xor__ operator (X ^ Y) returns the intersection of X and Y. The carat is reflects the mathematical notation for the intersection of sets, but XOR really corresponds to the symmetric difference. A person from a mathematics backround would be inclined to think that X^Y is the intersection while someone from a Python background might be inclined to think that it is the symmetric difference. Which is preferred: consistency with mathematical notation or consistency with Python's notation?
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