Sympy summation with indexed variable

Question

I try to create a sympy expression with a Sum with an indexed variable as previous explain here However, I can not do lambdify of this expression and give an array to get th

Answer 1

Perhaps like this?

>>> s=Sum(Indexed('x',i),(i,1,3))
>>> f = lambda x: Subs(s.doit(), [s.function.subs(s.variables[0], j)
... for j in range(s.limits[0][1], s.limits[0][2] + 1)], x).doit()
>>> f((30,10,2))
42