Comment #1 on issue 2197 by [email protected]: differentiate in nested functions
http://code.google.com/p/sympy/issues/detail?id=2197
I think it is not the nested function, Fz is rather an operator, which defined as derivative by some variable "diffvar", and applied upon some function Ez with argument "argx":
Fz = lambda argx, diffvar: Ez(argx).diff(diffvar) So replace the last 2 lines in your code by those:
Fz = lambda argx, diffvar: Ez(argx).diff(diffvar) res = Fz(z+L,z) res
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