使用python的日志模块记录所有异常和错误 [英] Using python's logging module to log all exceptions and errors

问题描述

我想检查特定后台文件中的错误，但标准错误流由前台程序控制，问题中文件中的错误未显示.不过，我可以使用 logging 模块并将输出写入文件.我想知道如何使用它来记录所有异常、错误及其回溯.

I want to check for errors in a particular background file, but the standard error stream is being controlled by the program in the foreground and the errors in the file in the question are not being displayed. I can use the logging module and write output to a file, though. I was wondering how I can use this to log all exceptions, errors and their tracebacks.

推荐答案

记录程序中抛出的任何异常可能是个坏主意，因为 Python 也将异常用于正常的控制流.

It's probably a bad idea to log any exception thrown within the program, since Python uses exceptions also for normal control flow.

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因此，您应该只记录未捕获的异常.您可以使用记录器的 exception() 方法，一旦你有一个异常对象.

Therefore you should only log uncaught exceptions. You can easily do this using a logger's exception() method, once you have an exception object.

要处理所有未捕获的异常，您可以将脚本的入口点包装在 try...except 块中，或者通过重新分配 sys.excepthook():

To handle all uncaught exceptions, you can either wrap your script's entry point in a try...except block, or by installing a custom exception handler by re-assigning sys.excepthook():

import logging
import sys

logger = logging.getLogger('mylogger')
# Configure logger to write to a file...

def my_handler(type, value, tb):
    logger.exception("Uncaught exception: {0}".format(str(value)))

# Install exception handler
sys.excepthook = my_handler

# Run your main script here:
if __name__ == '__main__':
    main()

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