text: #!/usr/bin/python
  #
  # Show how to add a translucent legend
  
  # import pyplot module
  import matplotlib.pyplot as plt
  
  # draw 2 crossing lines
  plt.plot([0,1], label='going up')
  plt.plot([1,0], label='going down')
  
  # add the legend in the middle of the plot
  leg = plt.legend(fancybox=True, loc='center')
  # set the alpha value of the legend: it will be translucent
  leg.get_frame().set_alpha(0.5)
  
  # show the plot
  plt.show()
  