Dear all, 

I was wondering about a way to get a custom derivative output, 
that is more readable for an end-user. For example, in pynac.pyx, 
py_print_fderivative() returns the operator as 

    ostr = ''.join(['D[', ', '.join([repr(int(x)) for x in params]), ']'])

whereas it would be nice to have 

    ostr = ''.join(['D_{', ', '.join([repr(args[int(x)]) for x in params]), 
'}'])

What is a recommended way to get such a custom output from 
a level of an external package?
 
 Best regards, 

 Michal

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