- 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.

Lib/compiler/ast.py

@@ -1337,6 +1337,6 @@ class Yield(Node):
     def __repr__(self):
         return "Yield(%s)" % (repr(self.value),)
 
-for name, obj in globals().items():
+for name, obj in list(globals().items()):
     if isinstance(obj, type) and issubclass(obj, Node):
         nodes[name.lower()] = obj