class_docstr: Helper class for a fixed axis.
code: def change_tick_coord(self, coord_number=None):
      if coord_number is None:
          self.nth_coord_ticks = 1 - self.nth_coord_ticks
      elif coord_number in [0, 1]:
          self.nth_coord_ticks = coord_number
      else:
          raise Exception("wrong coord number")
  
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 3 for calling the FixedAxisArtistHelper obj's underlying member method code with example usage: obj.change_tick_coord(coord_number) without return types