From 3bae7ddf8e63889b185235f85a6695bc05d59059 Mon Sep 17 00:00:00 2001
From: Fred Drake <fdrake@acm.org>
Date: Tue, 6 Nov 2001 16:36:53 +0000
Subject: WeakKeyDictionary.has_key():  If the key being tested is not weakly
 referencable (weakref.ref() raises TypeError), return 0 instead of
 propogating the TypeError. This closes SF bug #478536; bugfix candidate.

---
 Lib/weakref.py | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/Lib/weakref.py b/Lib/weakref.py
index 39ec330..967458d 100644
--- a/Lib/weakref.py
+++ b/Lib/weakref.py
@@ -179,7 +179,11 @@ class WeakKeyDictionary(UserDict.UserDict):
         return self.data.get(ref(key),default)
 
     def has_key(self, key):
-        return self.data.has_key(ref(key))
+        try:
+            wr = ref(key)
+        except TypeError:
+            return 0
+        return self.data.has_key(wr)
 
     def items(self):
         L = []
-- 
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