Comment #24 on issue 2026 by ronan.l...@gmail.com: Exact, algebraic, and integer_power substitution
http://code.google.com/p/sympy/issues/detail?id=2026
I updated my branch (cf. comments 10, 12, 14). It's still at https://github.com/rlamy/sympy/commits/matching. The method is now called xreplace (I couldn't think of a good name) and its interface is as simple as possible: it only takes a dict-like object representing a replacement rule.
Comparing with the implementation of replace() raises an important question: should this work in top-down or bottom-up order? (xreplace is top-down, replace is bottom-up) I guess we probably need both orders, just like we have both preorder_traversal and postorder_traversal.
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