code: def _contour(self, method_name, *XYCL, **kwargs):
      if len(XYCL) <= 2:
          C = XYCL[0]
          ny, nx = C.shape
  
          gx = np.arange(0.0, nx, 1.0)
          gy = np.arange(0.0, ny, 1.0)
  
          X, Y = np.meshgrid(gx, gy)
          CL = XYCL
      else:
          X, Y = XYCL[:2]
          CL = XYCL[2:]
  
      contour_routine = self._get_base_axes_attr(method_name)
  
      if "transform" in kwargs:
          cont = contour_routine(self, X, Y, *CL, **kwargs)
      else:
          orig_shape = X.shape
          xy = np.vstack([X.flat, Y.flat])
          xyt = xy.transpose()
          wxy = self.transAux.transform(xyt)
          gx, gy = wxy[:, 0].reshape(orig_shape), wxy[:, 1].reshape(
              orig_shape
          )
          cont = contour_routine(self, gx, gy, *CL, **kwargs)
          for c in cont.collections:
              c.set_transform(self._parent_axes.transData)
  
      return cont
  
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 9 for calling the ParasiteAxesAuxTransBase obj's underlying member method code with example usage: obj._contour(method_name) and returns: cont