Nick Coghlan added the comment:
The difference in the errors below is the reason the systematic fix in
Benjamin's patch simply wasn't practical in 2.x (as it would have required a
complex deprecation dance to turn None, True and False into real keywords):
Python 2.7.3 (default, Jul 24 2012, 10:05:38)
[GCC 4.7.0 20120507 (Red Hat 4.7.0-5)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> class C: pass
...
>>> C.None
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
AttributeError: class C has no attribute 'None'
>>>
Python 3.2.3 (default, Jun 8 2012, 05:36:09)
[GCC 4.7.0 20120507 (Red Hat 4.7.0-5)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> class C: pass
...
>>> C.None
File "<stdin>", line 1
C.None
^
SyntaxError: invalid syntax
----------
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