bpo-36144: Add union operators to WeakValueDictionary584 (#19127)

1 files changed, 19 insertions, 0 deletions

diff --git a/Lib/weakref.py b/Lib/weakref.py
index 759ad6dfa3..5fa851dd6d 100644
--- a/Lib/weakref.py
+++ b/Lib/weakref.py
@@ -310,6 +310,25 @@ class WeakValueDictionary(_collections_abc.MutableMapping):
             self._commit_removals()
         return list(self.data.values())
 
+    def __ior__(self, other):
+        self.update(other)
+        return self
+
+    def __or__(self, other):
+        if isinstance(other, _collections_abc.Mapping):
+            c = self.copy()
+            c.update(other)
+            return c
+        return NotImplemented
+
+    def __ror__(self, other):
+        if isinstance(other, _collections_abc.Mapping):
+            c = self.__class__()
+            c.update(other)
+            c.update(self)
+            return c
+        return NotImplemented
+
 
 class KeyedRef(ref):
     """Specialized reference that includes a key corresponding to the value.