为什么一个overencompassing尝试：/除外：没有足够的捕捉异常？

Question

我认为，一个最qazxsw POI / qazxsw POI总是捕捉异常（事实上，这可能不是一个好主意是问题的外）：

try:

在except:我要去不过，我面临的情况

try:
    try:
        raise ValueError
    except:
        raise ValueError
except:
    pass

引发异常：

some code

为什么会这样呢？为什么不overencompassing

def process_batch(self):
    try:
        p = util.json_dumps(self.batch_data)
        mac = hmac.new(self.key, p)
        send_bytes = struct.pack('B', mac.digest_size) + mac.digest() + p
        s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
        try:
            try:
                s.connect((self.host, self.port))
            except socket.error:
                s.close()
                s = socket.socket(socket.AF_INET6, socket.SOCK_STREAM)
                s.connect((self.host, self.port))
            s.send(send_bytes)
        finally:
            s.close()
    except Exception:
        self.logger_logger.exception("Failed to send network data")

/

2019-02-09 23:32:51     INFO (simplemonitor) monitor passed: hass
2019-02-09 23:32:51     INFO (simplemonitor) monitor passed: dns
2019-02-09 23:32:51    ERROR (simplemonitor.logger-send-to-srv) Failed to send network data
Traceback (most recent call last):
  File "/opt/simplemonitor/Loggers/network.py", line 89, in process_batch
    s.connect((self.host, self.port))
ConnectionRefusedError: [Errno 111] Connection refused

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/opt/simplemonitor/Loggers/network.py", line 93, in process_batch
    s.connect((self.host, self.port))
socket.gaierror: [Errno -5] No address associated with hostname

捕捉到的异常？

Answer 1

在所提供的第二个代码示例中，try:消息事实上不是未处理的异常时，由于异常处理程序调用except:方法，该方法将与完整Traceback消息发送到日志流一起打印出指定的消息。如果logger.exception不理想，使用Traceback将在没有它一样Traceback水平产生日志消息。