- 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/base64.py b/Lib/base64.py
index 19de514..4eb60f1 100755
--- a/Lib/base64.py
+++ b/Lib/base64.py
@@ -126,9 +126,7 @@
     8: 'I', 17: 'R', 26: '2',
     }
 
-_b32tab = _b32alphabet.items()
-_b32tab.sort()
-_b32tab = [v for k, v in _b32tab]
+_b32tab = [v for k, v in sorted(_b32alphabet.items())]
 _b32rev = dict([(v, int(k)) for k, v in _b32alphabet.items()])