2.5のexit

if os.sep == ':':
    eof = 'Cmd-Q'
elif os.sep == '\\':
    eof = 'Ctrl-Z plus Return'
else:
    eof = 'Ctrl-D (i.e. EOF)'
class Quitter(object):
    def __init__(self, name):
        self.name = name
    def __repr__(self):
        return 'Use %s() or %s to exit' % (self.name, eof)
    def __call__(self, code=None):
        # Shells like IDLE catch the SystemExit, but listen when their
        # stdin wrapper is closed.
        try:
            sys.stdin.close()
        except:
            pass
        raise SystemExit(code)
__builtin__.quit = Quitter('quit')
__builtin__.exit = Quitter('exit')