Python日志记录和旋转文件 [英] Python logging and rotating files

问题描述

我有一个python程序正在写入由Linux的logrotate命令旋转的日志文件.发生这种情况时，我需要通知我的程序停止写入旧文件，并开始写入新文件.我可以处理信号，但是如何告诉python写入新文件?

I have a python program that is writing to a log file that is being rotated by Linux's logrotate command. When this happens I need to signal my program to stop writing to the old file and start writing to the new one. I can handle the signal but how do I tell python to write to the new file?

我正在这样打开文件:

logging.basicConfig(format='%(asctime)s:%(filename)s:%(levelname)s:%(message)s',filename=log_file, level=logging.INFO)

并像这样写:

logging.log(level,"%s" % (msg))

日志记录模块看起来非常强大，但也很庞大.谢谢.

The logging modules look very powerful but also overwhelming. Thanks.

推荐答案

不要使用logging.basicConfig，请使用WatchedFileHandler.这是使用方法.

Don't use logging.basicConfig, use WatchedFileHandler. Here's how to use it.

import time
import logging
import logging.handlers

def log_setup():
    log_handler = logging.handlers.WatchedFileHandler('my.log')
    formatter = logging.Formatter(
        '%(asctime)s program_name [%(process)d]: %(message)s',
        '%b %d %H:%M:%S')
    formatter.converter = time.gmtime  # if you want UTC time
    log_handler.setFormatter(formatter)
    logger = logging.getLogger()
    logger.addHandler(log_handler)
    logger.setLevel(logging.DEBUG)

log_setup()
logging.info('Hello, World!')
import os
os.rename('my.log', 'my.log-old')
logging.info('Hello, New World!')

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