Message 177046 - Python tracker

I claim that this is not a bug in the existing versions. It is documented as "illegal" to assign to None:

http://docs.python.org/2.7/library/constants.html?highlight=none#None

So what exactly happens if you manage to bypass the existing checks is implementation-specific (or, in the C sense, "undefined behavior"). Therefore, the reaction of Python 2.7 (e.g.) is perfectly fine.