code: def indexbox(msg="Shall I continue?", title=" ",
               choices=("Yes", "No"), image=None,
               default_choice='Yes', cancel_choice='No'):
      
      reply = bb.buttonbox(msg=msg,
                           title=title,
                           choices=choices,
                           image=image,
                           default_choice=default_choice,
                           cancel_choice=cancel_choice)
      if reply is None:
          return None
      for i, choice in enumerate(choices):
          if reply == choice:
              return i
      msg = ("There is a program logic error in the EasyGui code "
             "for indexbox.\nreply={0}, choices={1}".format(
                 reply, choices))
      raise AssertionError(msg)
docs: Display a buttonbox with the specified choices.
  
      :param str msg: the msg to be displayed
      :param str title: the window title
      :param list choices: a list or tuple of the choices to be displayed
      :param str image: Filename of image to display
      :param str default_choice: The choice you want highlighted
        when the gui appears
      :param str cancel_choice: If the user presses the 'X' close,
        which button should be pressed
      :return: the index of the choice selected, starting from 0