def get_queue_function_name(queue_name):
  """ Returns the function name of a queue which is not the queue name for
  namespacing and collision reasons.

  Args:
    queue_name: The name of a queue.
  Returns:
    The string representing the function name.
  """
  # Remove '-' because that character is not valid for a function name.
  queue_name = queue_name.replace('-', '_')
  return "queue___%s" % queue_name