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-rw-r--r--Lib/collections/__init__.py35
1 files changed, 32 insertions, 3 deletions
diff --git a/Lib/collections/__init__.py b/Lib/collections/__init__.py
index d993fe0..1f41ff9 100644
--- a/Lib/collections/__init__.py
+++ b/Lib/collections/__init__.py
@@ -20,6 +20,23 @@ from reprlib import recursive_repr as _recursive_repr
### OrderedDict
################################################################################
+class _OrderedDictKeysView(KeysView):
+
+ def __reversed__(self):
+ yield from reversed(self._mapping)
+
+class _OrderedDictItemsView(ItemsView):
+
+ def __reversed__(self):
+ for key in reversed(self._mapping):
+ yield (key, self._mapping[key])
+
+class _OrderedDictValuesView(ValuesView):
+
+ def __reversed__(self):
+ for key in reversed(self._mapping):
+ yield self._mapping[key]
+
class _Link(object):
__slots__ = 'prev', 'next', 'key', '__weakref__'
@@ -79,6 +96,8 @@ class OrderedDict(dict):
link_next = link.next
link_prev.next = link_next
link_next.prev = link_prev
+ link.prev = None
+ link.next = None
def __iter__(self):
'od.__iter__() <==> iter(od)'
@@ -162,9 +181,19 @@ class OrderedDict(dict):
return size
update = __update = MutableMapping.update
- keys = MutableMapping.keys
- values = MutableMapping.values
- items = MutableMapping.items
+
+ def keys(self):
+ "D.keys() -> a set-like object providing a view on D's keys"
+ return _OrderedDictKeysView(self)
+
+ def items(self):
+ "D.items() -> a set-like object providing a view on D's items"
+ return _OrderedDictItemsView(self)
+
+ def values(self):
+ "D.values() -> an object providing a view on D's values"
+ return _OrderedDictValuesView(self)
+
__ne__ = MutableMapping.__ne__
__marker = object()