我可以在一行中/通过日志记录来使Python输出异常吗? [英] Can I make Python output exceptions in one line / via logging?

问题描述

我正在使用AWS，并使用AWS cloudwatch查看日志.虽然事情在AWS上不会中断，但可以.我只是有这种情况.然后我搜索了Traceback并获得了线段

Traceback (most recent call last):

没有实际的回溯.我有一个有效的结构化日志记录设置(请参见其他问题)，我希望以类似的方式获得回溯.

所以代替:

Traceback (most recent call last):
  File "/home/math/Desktop/test.py", line 32, in <module>
    adf
NameError: name 'adf' is not defined

类似

{"message": "Traceback (most recent call last):\n      File \"/home/math/Desktop/test.py\", line 32, in <module>\n        adf\n    NameError: name 'adf' is not defined", "lineno": 35, "pathname": "/home/math/Desktop/test.py"}

甚至还可以使用JSON格式的字符串.

我能想到的唯一方法是巨大的try-except块.宠物小精灵风格.有更好的解决方案吗?

解决方案

您可以使用 sys.excepthook .每当脚本中发生异常时，就会调用它.

import logging
import sys
import traceback

def exception_logging(exctype, value, tb):
    """
    Log exception by using the root logger.

    Parameters
    ----------
    exctype : type
    value : NameError
    tb : traceback
    """
    write_val = {'exception_type': str(exctype),
                 'message': str(traceback.format_tb(tb, 10))}
    logging.exception(str(write_val))

然后，您必须在脚本中覆盖sys.excepthook的值.

sys.excepthook = exception_logging

现在，每当发生异常时，它将使用您的记录器处理程序记录下来.

注意:运行此操作前请不要忘记设置记录器

I am using AWS and use AWS cloudwatch to view logs. While things should not break on AWS, they could. I just had such a case. Then I searched for Traceback and just got the lines

Traceback (most recent call last):

without the actual traceback. I have a working structured logging setup (see other question) and I would like to get tracebacks in a similar way.

So instead of:

Traceback (most recent call last):
  File "/home/math/Desktop/test.py", line 32, in <module>
    adf
NameError: name 'adf' is not defined

something like

{"message": "Traceback (most recent call last):\n      File \"/home/math/Desktop/test.py\", line 32, in <module>\n        adf\n    NameError: name 'adf' is not defined", "lineno": 35, "pathname": "/home/math/Desktop/test.py"}

or even better also with the string in a JSON format.

The only way to achieve this I can think of is a giant try-except block. Pokemon-style. Is there a better solution?

解决方案

You can use sys.excepthook. It is invoked whenever an exception occurs in your script.

import logging
import sys
import traceback

def exception_logging(exctype, value, tb):
    """
    Log exception by using the root logger.

    Parameters
    ----------
    exctype : type
    value : NameError
    tb : traceback
    """
    write_val = {'exception_type': str(exctype),
                 'message': str(traceback.format_tb(tb, 10))}
    logging.exception(str(write_val))

Then in your script you have to override the value of sys.excepthook.

sys.excepthook = exception_logging

Now whenever an exception occurs it will be logged with your logger handler.

Note: Don't forget to setup logger before running this

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