R. David Murray added the comment:

Backward compatibility in that someone might be using the constant in their 
code.  You could just leave the existing value there with a comment that it is 
unused and use a leading _ for the new constants.  (Or you could delete 
it...it's not likely anyone is using it, I just tend to be conservative unless 
there is motivation to do otherwise.)

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue10354>
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