[SciPy-user] derivative

Hi all, Is it somehow possible to improve the accuracy of derivative ? A small example is attached. from scipy import * def func(x): return exp(2*x) for i in arange(1,6): print i,' derivative of exp(2*x) at x=0',derivative(func,0.0,0.01,i,order=7),'exact',2**i Any suggestion ? Nils