Comment #2 on issue 2822 by [email protected]: Move preorder_traversal to the core
http://code.google.com/p/sympy/issues/detail?id=2822
Why is this? Is it a technical need, or just because it makes more sense to be near the code that uses it?
Ah, I see now that iterables.py imports stuff from the core. I think it may be better if we make it so that we can import things from utilities from anywhere, i.e., move those imports inside the functions that use them.
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