class_docstr: An Axis class for the 3D plots.
code: def _axmask(self):
      axmask = [True, True, True]
      axmask[self._axinfo["i"]] = False
      return axmask
  
imports: import inspect
  import numpy
  import matplotlib
  from matplotlib import _api, artist, lines, axis, patches, transforms, colors
  from .None import art3d, proj3d
label_desc: Use image node_id 21 for calling the Axis obj's underlying member method code with example usage: obj._axmask() and returns: axmask