text: from bokeh.plotting import ColumnDataSource, figure, output_file, show
  
  output_file("toolbar.html")
  
  source = ColumnDataSource(data=dict(
      x=[1, 2, 3, 4, 5],
      y=[2, 5, 8, 2, 7],
      desc=['A', 'b', 'C', 'd', 'E'],
  ))
  
  TOOLTIPS = [
      ("index", "$index"),
      ("(x,y)", "($x, $y)"),
      ("desc", "@desc"),
  ]
  
  p = figure(plot_width=400, plot_height=400, tooltips=TOOLTIPS,
             title="Mouse over the dots")
  
  p.circle('x', 'y', size=20, source=source)
  
  show(p)
  