docstr: Return list of grid lines as a list of paths (list of points).
  
  *which* : "major" or "minor"
  *axis* : "both", "x" or "y"
docstr_tok: ["Return","list","of","grid","lines","as","a","list","of","paths","(","list","of","points",")",".","*","which","*",":","``","major","''","or","``","minor","''","*","axis","*",":","``","both","''",",","``","x","''","or","``","y","''"]
code: def get_gridlines(self, which, axis):
      """
      Return list of grid lines as a list of paths (list of points).
  
      *which* : "major" or "minor"
      *axis* : "both", "x" or "y"
      """
      return []
  
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 6 for calling the GridHelperBase obj's underlying member method code with example usage: obj.get_gridlines(which, axis) and returns: list