求交集
test1 = [1,2,3,4]
test2 = [2,4,5,5,7]
intersection = list(set(test1) & set(test2))

求并集
test1 = [1,2,3]
test2 = [5,7]
unionset = list(set(test1).union(set(test2)))

求差集
test1 = [1,2,3]
test2 = [2,3,5,7]
###test2有而test1没有的元素
difference = list(set(test2).difference(set(test1)))

求补集
test1 = [2,3]
test2 = [2,3,5,7]
complementaryset = list(set(test2) - (set(test1)))

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