Updates:
Labels: -Milestone-Release0.7.0 Milestone-Release0.7.1
Comment #3 on issue 2415 by asmeurer: Poly(x, x) * I != I * Poly(x, x)
http://code.google.com/p/sympy/issues/detail?id=2415
This is just because Expr.__mul__ eats up the Poly. To play it safe, you
should always to Poly*Poly (like Poly(x, x)*Poly(I, x)) or
Poly.as_expr()*Expr (like Poly(x, x).as_expr()*I), depending on what you
want.
And please don't block issues on this release unless they are really
important. I am trying to get the release out, but the number of issues at
http://code.google.com/p/sympy/issues/list?q=label:Milestone-Release0.7.0
keeps growing, instead of shrinking like it should.
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