Don't define has_key().
diff --git a/Lib/lib-tk/Canvas.py b/Lib/lib-tk/Canvas.py
index 83d7bba..89929e7 100644
--- a/Lib/lib-tk/Canvas.py
+++ b/Lib/lib-tk/Canvas.py
@@ -37,8 +37,6 @@
                                              'itemconfigure',
                                              (self.id,))))
         return self._keys
-    def has_key(self, key):
-        return key in self.keys()
     def __contains__(self, key):
         return key in self.keys()
     def addtag(self, tag, option='withtag'):