code: def clip_box(dataset, bounds=None, invert=True, factor=0.35):
          
          if bounds is None:
              def _get_quarter(dmin, dmax):
                  """internal helper to get a section of the given range"""
                  return dmax - ((dmax - dmin) * factor)
              xmin, xmax, ymin, ymax, zmin, zmax = dataset.bounds
              xmin = _get_quarter(xmin, xmax)
              ymin = _get_quarter(ymin, ymax)
              zmin = _get_quarter(zmin, zmax)
              bounds = [xmin, xmax, ymin, ymax, zmin, zmax]
          if isinstance(bounds, (float, int)):
              bounds = [bounds, bounds, bounds]
          if len(bounds) == 3:
              xmin, xmax, ymin, ymax, zmin, zmax = dataset.bounds
              bounds = (xmin,xmin+bounds[0], ymin,ymin+bounds[1], zmin,zmin+bounds[2])
          if not isinstance(bounds, collections.Iterable) or len(bounds) != 6:
              raise AssertionError('Bounds must be a length 6 iterable of floats')
          xmin, xmax, ymin, ymax, zmin, zmax = bounds
          alg = vtk.vtkBoxClipDataSet()
          alg.SetInputDataObject(dataset)
          alg.SetBoxClip(xmin, xmax, ymin, ymax, zmin, zmax)
          port = 0
          if invert:
              # invert the clip if needed
              port = 1
              alg.GenerateClippedOutputOn()
          alg.Update()
          return _get_output(alg, oport=port)
docs: Clips a dataset by a bounding box defined by the bounds. If no bounds
          are given, a corner of the dataset bounds will be removed.
  
          Parameters
          ----------
          bounds : tuple(float)
              Length 6 iterable of floats: (xmin, xmax, ymin, ymax, zmin, zmax)
  
          invert : bool
              Flag on whether to flip/invert the clip
  
          factor : float, optional
              If bounds are not given this is the factor along each axis to
              extract the default box.