Comment #2 on issue 2436 by [email protected]: eval(str(Derivative())) http://code.google.com/p/sympy/issues/detail?id=2436
No, I think that won't do it. D() from your idea in issue 1620 is an operator that receives a function (or Lambda) and positional (integer) args with respect to which it should take the derivative.
So Derivative(f(x), x) is D(f, 1)(x), and D(f(x), x) should raise, because f(x) is an expression, not a function, and x is not an integer.
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