Raymond Hettinger added the comment:
One way to do it:
-----------------
diff --git a/Lib/weakref.py b/Lib/weakref.py
index 1802f32a20..18f26ea8b2 100644
--- a/Lib/weakref.py
+++ b/Lib/weakref.py
@@ -136,6 +136,8 @@ class WeakValueDictionary(collections.abc.MutableMapping):
self._commit_removals()
o = self.data[key]()
if o is None:
+ if hasattr(self, '__missing__'):
+ return self.__missing__(key)
raise KeyError(key)
else:
return o
Another way to do it:
---------------------
diff --git a/Lib/weakref.py b/Lib/weakref.py
index 1802f32a20..9951b0fb06 100644
--- a/Lib/weakref.py
+++ b/Lib/weakref.py
@@ -131,12 +131,15 @@ class WeakValueDictionary(collections.abc.MutableMapping):
key = l.pop()
_remove_dead_weakref(d, key)
+ def __missing__(self, key):
+ raise KeyError(key)
+
def __getitem__(self, key):
if self._pending_removals:
self._commit_removals()
o = self.data[key]()
if o is None:
- raise KeyError(key)
+ return self.__missing__(key)
else:
return o
----------
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Python tracker <[email protected]>
<http://bugs.python.org/issue31254>
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