text: import Tkinter as tki
  
  def scroll_text(s, how_many):
      return s[how_many:] + s[:how_many]
  
  direction = 1
  tk = tki.Tk()
  var = tki.Variable(tk)
  
  def mouse_handler(point):
      global direction
      direction *= -1
  
  def timer_handler():
      var.set(scroll_text(var.get(),direction))
      tk.after(125, timer_handler)
  
  var.set('Hello, World! ')
  tki.Label(tk, textvariable=var).pack()
  tk.bind("<Button-1>", mouse_handler)
  tk.after(125, timer_handler)
  tk.title('Python Animation')
  tki.mainloop()
  