a class ``B`` is expected if and only if ``A`` is a subclass of ``B``.
This requirement previously also applied to abstract base classes, such as
-:class:`Iterable`. The problem with this approach is that a class had
+:class:`~collections.abc.Iterable`. The problem with this approach is that a class had
to be explicitly marked to support them, which is unpythonic and unlike
what one would normally do in idiomatic dynamically typed Python code.
-For example, this conforms to the :pep:`484`::
+For example, this conforms to :pep:`484`::
from typing import Sized, Iterable, Iterator