迭代器迭代 “可迭代对象”.

    1. list1 = [1, 2, 3]
    3. it = iter(list1)  # 创建迭代器
    4. print(next(it))
    5. print(next(it))
    6. print(next(it))
    8. # 输出
    9. 1
    10. 2
    11. 3