- PEP 3106: dict.iterkeys(), .iteritems(), .itervalues() are now gone;
  and .keys(), .items(), .values() return dict views.

The dict views aren't fully functional yet; in particular, they can't
be compared to sets yet.  but they are useful as "iterator wells".

There are still 27 failing unit tests; I expect that many of these
have fairly trivial fixes, but there are so many, I could use help.
diff --git a/Lib/dumbdbm.py b/Lib/dumbdbm.py
index 6c500bc..1c9b572 100644
--- a/Lib/dumbdbm.py
+++ b/Lib/dumbdbm.py
@@ -109,7 +109,7 @@
 
         f = self._open(self._dirfile, 'w')
         self._chmod(self._dirfile)
-        for key, pos_and_siz_pair in self._index.iteritems():
+        for key, pos_and_siz_pair in self._index.items():
             f.write("%r, %r\n" % (key, pos_and_siz_pair))
         f.close()
 
@@ -202,7 +202,7 @@
         return key in self._index
 
     def iterkeys(self):
-        return self._index.iterkeys()
+        return self._index.keys()
     __iter__ = iterkeys
 
     def __len__(self):