:ref:`abstract-base-classes` that can be used to test whether a class provides a
particular interface, for example, whether it is hashable or a mapping.
-.. seealso::
-
- Latest version of the :source:`collections module Python source code
- <Lib/collections.py>`
-
:class:`Counter` objects
------------------------
.. seealso::
+ * Latest version of the :source:`collections module Python source code
+ <Lib/collections.py>`
+
* Latest version of the :source:`Python source code for the collections
abstract base classes <Lib/_abcoll.py>`