newquitter.py

import os, sys
class Newquitter(object):
  def __call__(s, v):
    sys.exit(v)

  def __repr__(s):
    if os.isatty(sys.stdout.fileno()): sys.exit(0)
    else: return "Use exit() or Ctrl-D (i.e. EOF) to exit"

  __str__ = __repr__

exit = Newquitter()