Is there any way in sympy to express the derivative of an abstract function 
evaluated at a point?  I can do

import sympy
x,x0 = sympy.var(('x','x0'))
f=sympy.Function('f') (x)
sympy.diff(f)

to get the derivative w.r.t. x evaluated at x.  If I do

sympy.diff(f).subs(x,x0)

then I get the derivative w.r.t. x0 evaluated at x0.  Can I get the 
derivative w.r.t. x evaluated at x0?

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