python退出无限循环与KeyboardInterrupt异常

参考:http://www.voidcn.com/article/p-pmlncsni-bvo.html

 

按下Ctrl C时,我的while循环不会退出.它似乎忽略了我的KeyboardInterrupt异常.循环部分如下所示：

 

 

while True:
  try:
    if subprocess_cnt <= max_subprocess:
      try:
        notifier.process_events()
        if notifier.check_events():
          notifier.read_events()
      except KeyboardInterrupt:
        notifier.stop()
        break
    else:
      pass
  except (KeyboardInterrupt, SystemExit):
    print '\nkeyboardinterrupt found!'
    print '\n...Program Stopped Manually!'
    raise

同样,我不确定问题是什么,但我的终端甚至从未打印过我的异常中的两个打印警报.有人能帮我解决这个问题吗？

 

用raise语句替换break语句,如下所示：

 

 

while True:
  try:
    if subprocess_cnt <= max_subprocess:
      try:
        notifier.process_events()
        if notifier.check_events():
          notifier.read_events()
      except KeyboardInterrupt:
        notifier.stop()
        print 'KeyboardInterrupt caught'
        raise  # the exception is re-raised to be caught by the outer try block
    else:
      pass
  except (KeyboardInterrupt, SystemExit):
    print '\nkeyboardinterrupt caught (again)'
    print '\n...Program Stopped Manually!'
    raise

except块中的两个print语句应该以'(再次)’出现的第二个执行.