code: def set_extremes(self, e1, e2):
      if e1 is None:
          e1 = -np.inf
      if e2 is None:
          e2 = np.inf
      self._extremes = e1, e2
  
imports: import functools
  import numpy
  import matplotlib
  from matplotlib import _api
  from matplotlib.path import Path
  from matplotlib.transforms import Affine2D, IdentityTransform
  from .axislines import _FixedAxisArtistHelperBase, _FloatingAxisArtistHelperBase, GridHelperBase
  from .axis_artist import AxisArtist
  from .grid_finder import GridFinder
label_desc: Use image node_id 2 for calling the FloatingAxisArtistHelper obj's underlying member method code with example usage: obj.set_extremes(e1, e2) without return types