Python - Retrieve contours coordinate

Hello,

i was able to generate nice surface contours via python:

go.Contour(x=self.gridX[:,0],y=self.gridY[0,:],z=gridZ,contours=dict(start=2,end=7,size=1))

and i would like to retrieve their x,y coordinates. Is it possible?

Furthermore: is the contour computation performed within python or via the js GPU? and what is the interpolation schemed used?

Best regards