code: def ellipticity_lens_light(self, kwargs_lens_light, center_x=0, center_y=0, model_bool_list=None, deltaPix=None,
                                 numPix=None):
          
          if model_bool_list is None:
              model_bool_list = [True] * len(kwargs_lens_light)
          if numPix is None:
              numPix = 100
          if deltaPix is None:
              deltaPix = 0.05
          x_grid, y_grid = util.make_grid(numPix=numPix, deltapix=deltaPix)
          x_grid += center_x
          y_grid += center_y
          I_xy = self._lens_light_internal(x_grid, y_grid, kwargs_lens_light, model_bool_list=model_bool_list)
          e1, e2 = analysis_util.ellipticities(I_xy, x_grid, y_grid)
          return e1, e2
docs: make sure that the window covers all the light, otherwise the moments may give to low answers.
  
          :param kwargs_lens_light:
          :param center_x:
          :param center_y:
          :param model_bool_list:
          :param deltaPix:
          :param numPix:
          :return: