--- a/ch3ex4.py	Mon Dec 10 19:42:38 2012 -0600
+++ b/ch3ex4.py	Mon Dec 10 19:58:03 2012 -0600
@@ -61,6 +61,12 @@
         m = self.find_map(k)
         return m.get(k)
 
+    def iteritems(self):
+        """Generator function to yield items in the map."""
+        for lm in self.maps:
+            for t in lm.items:
+                yield t
+
 
 class HashMap(object):
     """An implementation of a hashtable using a BetterMap
@@ -92,9 +98,8 @@
         """Makes a new map, twice as big, and rehashes the items."""
         new_maps = BetterMap(self.num * 2)
 
-        for m in self.maps.maps:
-            for k, v in m.items:
-                new_maps.add(k, v)
+        for k, v in self.maps.iteritems():
+            new_maps.add(k, v)
 
         self.maps = new_maps