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from aatree import * x = TreeList() y = AATreeList() def test(a): a[0] = 1 a[1] = 2 a[2] = 3 a[3] = 4 a[1] = 'b' del a[2] assert a.index('b') == 1 assert a.index(4) == 2 test(x) test(y)