[Python] How can I program laurent series coefficients with Sympy module in Python?

I want to program laurent series coefficients with Sympy module, because this is my university task, but I face some problems. How can I build sequence of coefficents if I can't calculate coefficients of correct part of laurent series like this

a_n = sp.SeqFormula(sp.diff(w, (z, n), evaluate = True).subs({z : 1}) / sp.factorial(n), (n, 0, +sp.oo))


The problem is that derivative is not calculated at the specified point and it looks like

sp.diff(w, (z, n), evaluate = False)


But formula even has

d / dx


and

|


like in Newton formula. The problem is that counter

n


probably doesn't allow me to calculate derivative.

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