Issue 10533: Need example of using __missing__.
diff --git a/Doc/library/stdtypes.rst b/Doc/library/stdtypes.rst
index be0c8d5..be93ece 100644
--- a/Doc/library/stdtypes.rst
+++ b/Doc/library/stdtypes.rst
@@ -2117,8 +2117,20 @@
returned or raised by the ``__missing__(key)`` call if the key is not
present. No other operations or methods invoke :meth:`__missing__`. If
:meth:`__missing__` is not defined, :exc:`KeyError` is raised.
- :meth:`__missing__` must be a method; it cannot be an instance variable. For
- an example, see :class:`collections.defaultdict`.
+ :meth:`__missing__` must be a method; it cannot be an instance variable::
+
+ >>> class Counter(dict):
+ ... def __missing__(self, key):
+ ... return 0
+ >>> c = Counter()
+ >>> c['red']
+ 0
+ >>> c['red'] += 1
+ >>> c['red']
+ 1
+
+ See :class:`collections.Counter` for a complete implementation including
+ other methods helpful for accumulating and managing tallies.
.. describe:: d[key] = value