在引用迭代器和迭代对象时
from collections import Iterable
from collections import Iterator
出现以下错误：
: DeprecationWarning: Using or importing the ABCs from 'collections' instead of from 'collections.abc' is deprecated, and in 3.8 it will stop working from collections import Iterable
DeprecationWarning: Using or importing the ABCs from 'collections' instead of from 'collections.abc' is deprecated, and in 3.8 it will stop working from collections import Iterator
修改为如下代码，即可消除错误：
from collections.abc import Iterable
from collections.abc import Iterator