Using or importing the ABCs from ‘collections‘ instead of from ‘collections.abc‘ is deprecated, and

用python实现import语句时，出现了以下问题：

>>> from collections import Iterable
__main__:1: DeprecationWarning: Using or importing the ABCs from 'collections' instead of from 'collections.abc' is deprecated, and in 3.8 it will stop working

问题原因：
版本更新发出的警告。目前可以忽略，再次输入可正常使用。