code: def upper_xlim(self):
      pts = [[0.0, 1.0], [1.0, 1.0]]
      return self.transDataToAxes.inverted().transform(pts)[:, 0]
  
imports: from contextlib import ExitStack
  import itertools
  import matplotlib.pyplot
  from matplotlib.testing.decorators import image_comparison
  from matplotlib.axes import Axes
  import matplotlib.transforms
  import matplotlib.axis
  import matplotlib.spines
  import matplotlib.patches
  from matplotlib.projections import register_projection
label_desc: Use image node_id 5 for calling the SkewXAxes obj's underlying member method code with example usage: obj.upper_xlim() and returns: self