Python 异常咳嗽，但堆栈跟踪仍然打印

Question

我试图理解为什么堆栈跟踪会被打印事件 虽然异常被捕获。以下是不同方法的示例：

方法 1

import soco
try:
    ... code that can result with the exception...
except soco.exceptions.SoCoUPnPException as e:
    logger.warning("Exception caught. Not expecting trace")

方法 2

from soco.exceptions import SoCoUPnPException
try:
    ... code that can result with the exception...
except SoCoUPnPException as e:
    logger.warning("Exception caught. Not expecting trace")

方法 3

try:
    ... code that can result with the exception...
except Exception as e:
    logger.warning("Exception caught. Not expecting trace")

它们都导致相同的错误：

ERROR [soco.services:410] UPnP Error 701 received: Transition not available from 10.10.10.114
Traceback (most recent call last):
  File "/usr/lib/python3.5/site-packages/soco/services.py", line 408, in send_command
    self.handle_upnp_error(response.text)
  File "/usr/lib/python3.5/site-packages/soco/services.py", line 469, in handle_upnp_error
    error_xml=xml_error
soco.exceptions.SoCoUPnPException: UPnP Error 701 received: Transition not available from 10.10.10.114
WARNING [senic_hub.nuimo_app.components.sonos:180] Exception caught. Not expecting trace

我希望只打印 logger.warning("Exception caught. Not expecting trace") 部分而不是整个跟踪。

更新

删除了try/catch 语句，在这种情况下soco.exceptions.SoCoUPnPException 会被提升两次。

异常代码：https://github.com/SoCo/SoCo/blob/release-0.14/soco/exceptions.py#L22

我在这里错过了什么？

Answer 1

异常被正确捕获。检查Logger 类的文档。使用它的方式会导致默认打印异常信息（如debug 部分中所述；info、warning 等级别也使用相同的行为）。

有三个关键字参数 (Python 3) 可用于调整此行为：

• exc_info - 将异常信息添加到日志消息中
• stack_info - 将堆栈信息添加到日志消息中仅限 Python 3
• extra - 接受一个字典来填充用于记录事件的LogRecord 的__dict__。

要抑制堆栈和异常信息，请尝试以下操作：

import logging
import soco

try:
    ... code that can create exception ...
except soco.exceptions.SoCoUPnPException as e:
    logger.warning("Exception caught. Not expecting trace", exc_info=False, stack_info=False)    # Remove the 'stack_info=False' for Python 2