[issue4327] Patch: simplify complex constant assignment statements

[David Turner]

David Turner <novalis at novalis.org> added the comment:

Sure, but that's an even bigger change.  Every piece of code which
modifies the AST would now also have to modify parent pointers.  Having
the pointers would make many things easier, but I didn't want to make a
very invasive change like that without thinking it through thoroughly.

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<http://bugs.python.org/issue4327>
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