code: def set_viewlim_mode(self, mode):
      if mode not in [None, "equal", "transform"]:
          raise ValueError("Unknown mode : %s" % (mode,))
      else:
          self._viewlim_mode = mode
  
imports: from __future__ import absolute_import, division, print_function, unicode_literals
  import six
  from matplotlib import artist, collections, transforms, rcParams
  from matplotlib.axes import subplot_class_factory
  from matplotlib.transforms import Bbox
  from .mpl_axes import Axes
  import numpy
label_desc: Use image node_id 3 for calling the ParasiteAxesAuxTransBase obj's underlying member method code with example usage: obj.set_viewlim_mode(mode) without return types