登录Python脚本无效:导致日志文件为空 [英] Logging in a Python script is not working: results in empty log files

问题描述

我有一个具有日志记录功能的脚本，并且它停止工作(日志记录，而不是脚本).我写了一个小例子来说明问题:

I had a script with logging capabilities, and it stopped working (the logging, not the script). I wrote a small example to illustrate the problem:

import logging
from os import remove
from os.path import exists


def setup_logger(logger_name, log_file, level=logging.WARNING):
    # Erase log if already exists
    if exists(log_file):
        remove(log_file)
    # Configure log file
    l = logging.getLogger(logger_name)
    formatter = logging.Formatter('%(message)s')
    fileHandler = logging.FileHandler(log_file, mode='w')
    fileHandler.setFormatter(formatter)
    streamHandler = logging.StreamHandler()
    streamHandler.setFormatter(formatter)
    l.setLevel(level)
    l.addHandler(fileHandler)
    l.addHandler(streamHandler)


if __name__ == '__main__':
    setup_logger('log_pl', '/home/myuser/test.log')
    log_pl = logging.getLogger('log_pl')
    log_pl.info('TEST')
    log_pl.debug('TEST')

在脚本末尾，已创建文件test.log，但该文件为空.

At the end of the script, the file test.log is created, but it is empty.

我想念什么?

推荐答案

您的 setup_logger 函数将(默认)级别指定为 WARNING

Your setup_logger function specifies a (default) level of WARNING

def setup_logger(logger_name, log_file, level=logging.WARNING):

...然后您以后记录两个事件，这些事件的级别比 WARNING 低，并且应该被忽略:

...and you later log two events that are at a lower level than WARNING, and are ignored as they should be:

log_pl.info('TEST')
log_pl.debug('TEST')

如果将调用 setup_logger 函数的代码更改为:

If you change your code that calls your setup_logger function to:

if __name__ == '__main__':
    setup_logger('log_pl', '/home/myuser/test.log', logging.DEBUG)

...我希望它能如您所愿.

...I'd expect that it works as you'd like.

请参阅Logging HOWTO中的简单示例.页.

See the simple example in the Logging HOWTO page.

这篇关于登录Python脚本无效:导致日志文件为空的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！