Now supports entire Python 2.0 language and still supports Python

1.5.2.  The compiler generates code for the version of the interpreter
it is run under.

ast.py:
    Print and Printnl add dest attr for extended print
    new node AugAssign for augmented assignments
    new nodes ListComp, ListCompFor, and ListCompIf for list
        comprehensions

pyassem.py:
    add work around for string-Unicode comparison raising UnicodeError
        on comparison of two objects in code object's const table

pycodegen.py:
    define VERSION, the Python major version number
    get magic number using imp.get_magic() instead of hard coding
    implement list comprehensions, extended print, and augmented
        assignment; augmented assignment uses Delegator classes (see
        doc string)
    fix import and tuple unpacking for 1.5.2

transformer.py:
    various changes to support new 2.0 grammar and old 1.5 grammar
    add debug_tree helper than converts and symbol and token numbers
    to their names

Lib/compiler/pyassem.py

@@ -253,8 +253,14 @@ class PyFlowGraph(FlowGraph):
 
     def _lookupName(self, name, list):
         """Return index of name in list, appending if necessary"""
-        if name in list:
-            i = list.index(name)
+        found = None
+        t = type(name)
+        for i in range(len(list)):
+            # must do a comparison on type first to prevent UnicodeErrors 
+            if t == type(list[i]) and list[i] == name:
+                found = 1
+                break
+        if found:
             # this is cheap, but incorrect in some cases, e.g 2 vs. 2L
             if type(name) == type(list[i]):
                 return i