使用完整堆栈跟踪记录错误时在条目之间添加分隔

Question

我目前正在使用带有exc_info=True的logging模块使用完整的堆栈跟踪记录错误。

但是结果真的很难从视觉上解析，因为记录的异常之间没有分隔符。 当您使用raise... from语法时，情况会变得更糟，因为它的输出包含空行，所以您的眼睛会被吸引到堆栈跟踪中间的某个地方，而不是开头。

我怎样才能得到更好的格式？ 就像在每个堆栈跟踪之后的一行 -------- 一样。

代码示例：

#Setup
import logging

def setup_logger(name, log_file, level=logging.INFO, removeExistingHandlers=True):
    """Function setup different loggers as you want"""
    logger = logging.getLogger(name)
    logger.setLevel(level)

    #remove existing handlers
    ##without this, running the script multiple times means the log filess will be added as handlers
    ##multiple times, and every warning gets written into the log multiple times
    if removeExistingHandlers:
        existingHandlers = logger.handlers.copy()
        for exHandler in existingHandlers:
            logger.removeHandler(exHandler)

    #add new handler
    handler = logging.FileHandler(log_file)
    formatter = logging.Formatter('%(asctime)s %(levelname)s %(message)s')
    handler.setFormatter(formatter)

    logger.addHandler(handler)

    return logger


def do_something():
    try:
        raise Exception("ok")
    except Exception as e:
        raise Exception("WORSE") from e

errorLog = setup_logger('stacktrace_logger', 'err.log')

#Use
try:
    raise Exception("bad")
except Exception as e:
    errorLog.error(e, exc_info=True)

try:
    do_something()
except Exception as e:
    errorLog.error(e, exc_info=True)

Answer 1

看起来你想要一个自定义格式化程序，请参见https://docs.python.org/fr/3/howto/logging-cookbook.html#customized-exception-formatting

Answer 2

根据 Bruno 的建议，执行此工作的自定义格式化程序的实现。

class SeperatedExcFormatter(logging.Formatter):
    def formatException(self, exc_info):
        result = super().formatException(exc_info)
        if exc_info:
            result = result + "\n------------------------------------------------"
        return result

要使用，请将formatter = logging.Formatter('%(asctime)s %(levelname)s %(message)s')替换为formatter = SeperatedExcFormatter('%(asctime)s %(levelname)s %(message)s')