Several changes in one:

(1) dictionaries/mappings now have attributes values() and items() as
well as keys(); at the C level, use the new function mappinggetnext()
to iterate over a dictionary.

(2) "class C(): ..." is now illegal; you must write "class C: ...".

(3) Class objects now know their own name (finally!); and minor
improvements to the way how classes, functions and methods are
represented as strings.

(4) Added an "access" statement and semantics.  (This is still
experimental -- as long as you don't use the keyword 'access' nothing
should be changed.)
diff --git a/Python/bltinmodule.c b/Python/bltinmodule.c
index b74b9cc..3d9504b 100644
--- a/Python/bltinmodule.c
+++ b/Python/bltinmodule.c
@@ -796,7 +796,9 @@
 
 /* Predefined exceptions */
 
+object *AccessError;
 object *AttributeError;
+object *ConflictError;
 object *EOFError;
 object *IOError;
 object *ImportError;
@@ -827,7 +829,9 @@
 static void
 initerrors()
 {
+	AccessError = newstdexception("AccessError");
 	AttributeError = newstdexception("AttributeError");
+	ConflictError = newstdexception("ConflictError");
 	EOFError = newstdexception("EOFError");
 	IOError = newstdexception("IOError");
 	ImportError = newstdexception("ImportError");