到达列表的末尾后，返回到开头，即python

class LoopIterator:
    def __init__(self, data):
        self.data = data
        self.index = 0

    def __iter__(self):
        return self

    def __next__(self):
        if self.index >= len(self.data):
            self.index = 0
        result = self.data[self.index]
        self.index += 1
        return result

my_list = [1, 2, 3, 4, 5]
my_iterator = LoopIterator(my_list)

for i in range(10):
    print(next(my_iterator))

1
2
3
4
5
1
2
3
4
5