a = {1, 2, 3} a {1, 2, 3} a= (1, 2, 3) a (1, 2, 3) b = (1, [2, 3]) b (1, [2, 3]) s1 = [a, b] s1 [(1, 2, 3), (1, [2, 3])]
前面两行忽略。。
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