Comment #10 on issue 2488 by asmeurer: SymPy 0.7.0 http://code.google.com/p/sympy/issues/detail?id=2488
No, this is the version that breaks compatibility (see the first part of the release notes). Also, it's a pretty big release what with the new polys and all.
On the other hand, although supporting Python 3 would be big news, it's not very big as far as actual changes go.
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