Comment #10 on issue 1304 by asmeurer: Integrate sqrt(x**2 + y**2) fails http://code.google.com/p/sympy/issues/detail?id=1304
That is not a bug. It is because Python is turning the 1/2 into 0, so you are just integrating 0 with respect to x and y. See http://docs.sympy.org/dev/gotchas.html#python-numbers-vs-sympy-numbers. You should use S(1)/2, or just use sqrt (sqrt(expr) is exactly the same as expr**(S(1)/2); the one is just a shortcut for the other).
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