old_contents: #!/usr/bin/env python
  # -*- coding: utf-8 -*-
  
  import vtk
  
  def main():
      colors = vtk.vtkNamedColors()
      lineColor = colors.GetColor3d("peacock")
      modelColor = colors.GetColor3d("silver")
      backgroundColor = colors.GetColor3d("wheat")
  
      modelSource = vtk.vtkSphereSource()
  
      plane = vtk.vtkPlane()
  
      cutter = vtk.vtkCutter()
      cutter.SetInputConnection(modelSource.GetOutputPort())
      cutter.SetCutFunction(plane)
      cutter.GenerateValues(10, -.5, .5)
  
      modelMapper = vtk.vtkPolyDataMapper()
      modelMapper.SetInputConnection(modelSource.GetOutputPort())
  
      model = vtk.vtkActor()
      model.SetMapper(modelMapper)
      model.GetProperty().SetDiffuseColor(modelColor)
      model.GetProperty().SetInterpolationToFlat()
  
      stripper = vtk.vtkStripper()
      stripper.SetInputConnection(cutter.GetOutputPort())
      stripper.JoinContiguousSegmentsOn()
  
      linesMapper = vtk.vtkPolyDataMapper()
      linesMapper.SetInputConnection(stripper.GetOutputPort())
  
      lines = vtk.vtkActor()
      lines.SetMapper(linesMapper)
      lines.GetProperty().SetDiffuseColor(lineColor)
      lines.GetProperty().SetLineWidth(3.)
  
      renderer = vtk.vtkRenderer()
      renderWindow = vtk.vtkRenderWindow()
  
      renderWindow.AddRenderer(renderer)
      renderWindow.SetSize(640, 480)
  
      interactor = vtk.vtkRenderWindowInteractor()
      interactor.SetRenderWindow(renderWindow)
  
      # Add the actors to the renderer.
      renderer.AddActor(model)
      renderer.AddActor(lines)
      renderer.SetBackground(backgroundColor)
  
      # This starts the event loop and as a side effect causes an
      # initial render.
      renderWindow.Render()
      interactor.Start()
  
      # Extract the lines from the polydata.
      numberOfLines = cutter.GetOutput().GetNumberOfLines()
  
      print("-----------Lines without using vtkStripper")
      print("There are {0} lines in the polydata".format(numberOfLines))
  
      numberOfLines = stripper.GetOutput().GetNumberOfLines()
      points = stripper.GetOutput().GetPoints()
      cells = stripper.GetOutput().GetLines()
      cells.InitTraversal()
  
      print("-----------Lines using vtkStripper")
      print("There are {0} lines in the polydata".format(numberOfLines))
  
      indices = vtk.vtkIdList()
      lineCount = 0
  
      while cells.GetNextCell(indices):
          print("Line {0}:".format(lineCount))
          for i in range(indices.GetNumberOfIds()):
              point = points.GetPoint(indices.GetId(i))
              print("\t({0} ,{1}, {2})".format(point[0], point[1], point[2]))
          lineCount += 1
  
  if __name__ == "__main__":
      main()
  
new_contents: #!/usr/bin/env python
  # -*- coding: utf-8 -*-
  
  import vtk
  
  def main():
      colors = vtk.vtkNamedColors()
      lineColor = colors.GetColor3d("peacock")
      modelColor = colors.GetColor3d("silver")
      backgroundColor = colors.GetColor3d("wheat")
  
      modelSource = vtk.vtkSphereSource()
  
      plane = vtk.vtkPlane()
  
      cutter = vtk.vtkCutter()
      cutter.SetInputConnection(modelSource.GetOutputPort())
      cutter.SetCutFunction(plane)
      cutter.GenerateValues(10, -.5, .5)
  
      modelMapper = vtk.vtkPolyDataMapper()
      modelMapper.SetInputConnection(modelSource.GetOutputPort())
  
      model = vtk.vtkActor()
      model.SetMapper(modelMapper)
      model.GetProperty().SetDiffuseColor(modelColor)
      model.GetProperty().SetInterpolationToFlat()
  
      stripper = vtk.vtkStripper()
      stripper.SetInputConnection(cutter.GetOutputPort())
      stripper.JoinContiguousSegmentsOn()
  
      linesMapper = vtk.vtkPolyDataMapper()
      linesMapper.SetInputConnection(stripper.GetOutputPort())
  
      lines = vtk.vtkActor()
      lines.SetMapper(linesMapper)
      lines.GetProperty().SetDiffuseColor(lineColor)
      lines.GetProperty().SetLineWidth(3.)
  
      renderer = vtk.vtkRenderer()
      renderWindow = vtk.vtkRenderWindow()
  
      renderWindow.AddRenderer(renderer)
      renderWindow.SetSize(640, 480)
  
      interactor = vtk.vtkRenderWindowInteractor()
      interactor.SetRenderWindow(renderWindow)
  
      # Add the actors to the renderer.
      renderer.AddActor(model)
      renderer.AddActor(lines)
      renderer.SetBackground(backgroundColor)
  
      # This starts the event loop and as a side effect causes an
      # initial render.
      renderWindow.Render()
      interactor.Start()
  
      # Extract the lines from the polydata.
      numberOfLines = cutter.GetOutput().GetNumberOfLines()
  
      print("-----------Lines without using vtkStripper")
      print("There are {0} lines in the polydata".format(numberOfLines))
  
      numberOfLines = stripper.GetOutput().GetNumberOfLines()
      points = stripper.GetOutput().GetPoints()
      cells = stripper.GetOutput().GetLines()
      cells.InitTraversal()
  
      print("-----------Lines using vtkStripper")
      print("There are {0} lines in the polydata".format(numberOfLines))
  
      indices = vtk.vtkIdList()
      lineCount = 0
  
      while cells.GetNextCell(indices):
          print("Line {0}:".format(lineCount))
          for i in range(indices.GetNumberOfIds()):
              point = points.GetPoint(indices.GetId(i))
              print("\t({0:0.6f} ,{1:0.6f}, {2:0.6f})".format(point[0], point[1], point[2]))
          lineCount += 1
  
  if __name__ == "__main__":
      main()
  
subject: format upto 6 decimal places in print statement.