def tick_format_function(value, index, tick_count):
    """
  This example shows how to define a function to format tick values for
  display.

  :param x:
    The value to be formatted.
  :param index:
    The index of the tick.
  :param tick_count:
    The total number of ticks being displayed.
  :returns:
    A stringified tick value for display.
  """
    return str(value)
