R. David Murray added the comment:

I think that in order to maintain backward compatibility the existing parse_ 
names should continue to have the same signature, but they could be 
re-implemented in terms of new versions that return the token.  That way if an 
application overrides the methods for some reason that existing code should 
continue to work.

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nosy: +r.david.murray

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<http://bugs.python.org/issue17410>
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