code: def _update_grid(self, x1, y1, x2, y2):
      self.grid_info = self.grid_finder.get_grid_info(x1, y1, x2, y2)
  
imports: from __future__ import absolute_import, division, print_function, unicode_literals
  import six
  from six.moves import zip
  from itertools import chain
  from .grid_finder import GridFinder
  from .axislines import AxisArtistHelper, GridHelperBase
  from .axis_artist import AxisArtist
  from matplotlib.transforms import Affine2D, IdentityTransform
  import numpy
  from matplotlib.path import Path
label_desc: Use image node_id 6 for calling the GridHelperCurveLinear obj's underlying member method code with example usage: obj._update_grid(x1, y1, x2, y2) without return types