python退出无限while循环并出现KeyboardInterrupt异常

Question

当按下 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，我不确定问题出在哪里，但我的终端甚至从未打印出异常中的两个打印警报。谁能帮我解决这个问题？

Answer 1

将 break 语句替换为 raise 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 block 中的两个打印语句应该以“(再次)”出现在第二个位置执行。