使用迭代器解决数组求和问题并仅测试相等性

class Iterator:
    def __init__(self, arr):
        self.arr = arr
        self.index = 0

    def has_next(self):
        return self.index < len(self.arr)

    def next(self):
        if self.has_next():
            result = self.arr[self.index]
            self.index += 1
            return result
        else:
            return None

def sum_array(arr):
    iterator = Iterator(arr)
    total = 0
    while iterator.has_next():
        total += iterator.next()
    return total

def test_array_sum(arr1, arr2):
    sum1 = sum_array(arr1)
    sum2 = sum_array(arr2)
    return sum1 == sum2