Add method to OrderedDict for repositioning keys to the ends.
diff --git a/Doc/library/collections.rst b/Doc/library/collections.rst
index 454817b..1cc4097 100644
--- a/Doc/library/collections.rst
+++ b/Doc/library/collections.rst
@@ -793,6 +793,23 @@
(key, value) pair. The pairs are returned in LIFO order if *last* is true
or FIFO order if false.
+ .. method:: move_to_end(key, last=True)
+
+ Move an existing *key* to either end of an ordered dictionary. The item
+ is moved to the right end if *last* is true (the default) or to the
+ beginning if *last* is false. Raises :exc:`KeyError` if the *key* does
+ not exist::
+
+ >>> d = OrderedDict.fromkeys('abcde')
+ >>> d.move_to_end('b')
+ >>> ''.join(d.keys)
+ 'acdeb'
+ >>> d.move_to_end('b', 0)
+ >>> ''.join(d.keys)
+ 'bacde'
+
+ .. versionadded:: 3.2
+
In addition to the usual mapping methods, ordered dictionaries also support
reverse iteration using :func:`reversed`.