test_fair_partition fails

[wojtask]

self = <test.test_chapter07.test_exercise7_1_2.TestExercise7_1_2 testMethod=test_fair_partition_any_array>

    def test_fair_partition_any_array(self):
        array = get_random_array()
        original = copy.deepcopy(array)
    
        pivot = fair_partition(array, 1, array.length)
    
        for x in array[:pivot]:
>           assert_that(x, is_(less_than_or_equal_to(array[pivot])))
E           AssertionError: 
E           Expected: a value less than or equal to <20>
E                but: was <52>