Comment #1 on issue 2852 by ronan.l...@gmail.com: is_constant(wrt) is needed http://code.google.com/p/sympy/issues/detail?id=2852
Sum(x,(x,1,10)).is_number == False is a bug. For the rest, I don't understand the distinction you're trying to make: evaluating pi is non-trivial and certainly much harder than evaluating the 2 objects you mention. Does that mean that pi isn't a number?
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