How to get the index of the grids intersected with surface

Hello everyone,

As the pic shows, I have a grid and a surface intersected

So I was trying to get the index of the intersected grid.

I was trying to script in Python:

indice = []

for i in range(0, len(x), 1):    

    arrCSX = rs.CurveSurfaceIntersection(x[i], y)    

    for j in range(0, len(arrCSX), 1):        

         if arrCSX[j][0] == 2 or arrCSX[j][0]== 1:            

                indice.append(i)

indice= a

But it couldn't work. Does anyone know how to sort it out?

Thx