code: def _init_gridlines(self, grid_helper=None):
      # It is done inside the cla.
      gridlines = self.new_gridlines(grid_helper)
  
      self.gridlines = gridlines
  
imports: from __future__ import absolute_import, division, print_function, unicode_literals
  import six
  import warnings
  import numpy
  from matplotlib import rcParams
  import matplotlib.artist
  import matplotlib.axes
  from matplotlib.path import Path
  from matplotlib.transforms import Bbox
  from .axisline_style import AxislineStyle
  from .axis_artist import AxisArtist, GridlinesCollection
label_desc: Use image node_id 7 for calling the Axes obj's underlying member method code with example usage: obj._init_gridlines(grid_helper) without return types