无法在python 3中捕获异常

时间:2019-04-12 20:10:03

标签: python-3.x exception

使用Python 3.7.3,仍在弄清楚异常处理的工作原理。

我正在使用slixmpp编写一个xmpp机器人。我正在尝试使其连接到服务器,如果它失去连接,它将尝试重新连接。似乎没有任何方法可以将它内置到slixmpp中,所以我要在自己的代码中写一些东西来实现它。

我已将slixmpp导入为xmpp,并使用它的send_raw()方法测试我们是否仍连接到服务器。

    while True:
        time.sleep(5)  # Send every 5 seconds just for testing purposes
        xmpp.send_raw('aroo?')

当我断开与服务器的连接时,它就是这样吐出来的:

    Traceback (most recent call last):
      File "C:\Program Files\Python37\lib\threading.py", line 917, in _bootstrap_inner
        self.run()
      File "testcom.py", line 19, in run
        eval(self.thing)()
      File "testcom.py", line 28, in check_conn
        xmpp.send_raw('aroo?')
      File "C:\Program Files\Python37\lib\site-packages\slixmpp\xmlstream\xmlstream.py", line 926, in send_raw
        raise NotConnectedError
    slixmpp.xmlstream.xmlstream.NotConnectedError   

我假设“ NotConnectedError”是我需要捕获的异常,所以我将代码放在try块中,如下所示:

    try:
        while True:
            time.sleep(5)  # Send every 5 seconds just for testing purposes
            xmpp.send_raw('aroo?')
    except NotConnectedError:
        # Do a thing
        pass

这就是我得到的:

    Traceback (most recent call last):
      File   "testcom.py", line 28, in check_conn
        xmpp.send_raw('aroo?')
      File "C:\Program Files\Python37\lib\site-packages\slixmpp\xmlstream\xmlstream.py", line 926, in send_raw
        raise NotConnectedError()
    slixmpp.xmlstream.xmlstream.NotConnectedError                                                                                             

    During handling of the above exception, another exception occurred:

    Traceback (most recent call last):
      File "C:\Program Files\Python37\lib\threading.py", line 917, in _bootstrap_inner
        self.run()
      "testcom.py", line 19, in run
        eval(self.thing)()
      File "testcom.py", line 29, in check_conn
        except NotConnectedError:
    NameError: name 'NotConnectedError' is not defined

有人可以告诉我我在做什么错吗?

谢谢!

1 个答案:

答案 0 :(得分:1)

我看不到您的导入,但请确保您有from slixmpp.xmlstream.xmlstream import NotConnectedError,否则在应用程序中没有NotConnectedError的定义。如果您也不想将其导入,也可以将NotConnectedError更改为xmpp.xmlstream.xmlstream.NotConnectedError