使用itertools添加标注

import itertools

def annotate(iterable):
    # 创建一个计数器迭代器
    counter = itertools.count(1)
    # 将原始迭代器和计数器迭代器进行组合
    annotated_iterable = zip(counter, iterable)
    return annotated_iterable

# 测试代码
data = ['a', 'b', 'c', 'd']
annotated_data = annotate(data)
for item in annotated_data:
    print(item)

(1, 'a')
(2, 'b')
(3, 'c')
(4, 'd')