test_sort.py 文件源码

def test_reverse_stability(self):
        data = [(random.randrange(100), i) for i in range(200)]
        copy1 = data[:]
        copy2 = data[:]
        def my_cmp(x, y):
            x0, y0 = x[0], y[0]
            return (x0 > y0) - (x0 < y0)
        def my_cmp_reversed(x, y):
            x0, y0 = x[0], y[0]
            return (y0 > x0) - (y0 < x0)
        data.sort(key=cmp_to_key(my_cmp), reverse=True)
        copy1.sort(key=cmp_to_key(my_cmp_reversed))
        self.assertEqual(data, copy1)
        copy2.sort(key=lambda x: x[0], reverse=True)
        self.assertEqual(data, copy2)

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