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s = [1, 2, 3] * 1000000 print(time.clock()) sum(s) print(time.clock()) print(time.clock()) res = 0 for i in s: res += i print(time.clock()) # output 0.032466 0.046174 0.046191 0.220772>>> set([1, 2]) == set([1, 2]) True >>> s1 = set([1, 2]) >>> s2 = set([1, 2]) >>> s1 == s2 True >>> s1.add(3) >>> s1 == s2 False >>> l1 = [1, 2] >>> l2 = [1, 2] >>> l1 == l2 True >>> l1.append(3) >>> l1 == l2 False
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