Python日志记录-每次应用程序运行时都会有新的日志文件 [英] Python logging - new log file every time application runs

问题描述

我一直在做研究，并且很难完成我希望达到的目标. 目前，这就是我所拥有的(testlog.py)

I've been doing research and am having an extremely difficult time completing what I'm hoping to achieve. Currently, this is what I have (testlog.py)

import logging
import logging.handlers

filename = "example.log"

logger = logging.getLogger()
logger.setLevel(logging.DEBUG)
formatter = logging.Formatter("%(asctime)s - %(name)s - %(levelname)s - %(message)s")

handler = logging.handlers.RotatingFileHandler(filename, mode = 'w', backupCount = 5)
handler.setLevel(logging.DEBUG)
handler.setFormatter(formatter)
logger.addHandler(handler)

ch = logging.StreamHandler()
ch.setLevel(logging.DEBUG)
ch.setFormatter(formatter)
logger.addHandler(ch)

for i in range(10):
   logger.debug("testx") #where I alternate x from 1 thru 9 to see output

它当前成功打印到控制台和example.log，这是我想要的.

It currently successfully prints out to the console and to example.log, which is what I want.

每次运行它时，它都会创建一个新文件并替换旧的example.log，如下所示:

Every time I run it, it makes a new file and replaces the old example.log like so:

使用logger.debug("test1")

example.log包含应有的test1 10次

example.log contains test1 10 times like it should

与logger.debug("test2")

它将example.log重写为包含test2 10次 等等...

it rewrites example.log to contain test2 10 times etc...

但是，我希望每次运行该程序时，该代码都能创建一个新的日志文件

However, I would like for the code to make a new log file every time I run the program so that I have

example.log

example.log

example.log1

example.log1

example.log2

example.log2

...

example.log5

example.log5

总而言之，我希望该文件将日志消息打印到控制台，日志文件中，并且每当我运行该程序时，我都希望有一个新的日志文件(最大* .5).谢谢！

In conclusion, I'd like for this file to print the log message to the console, to the log file, and I would like a new log file (up to *.5) whenever I run the program. Thanks!

推荐答案

logging.handlers.RotatingFileHandler 根据大小或日期轮换您的日志，但是您可以使用

logging.handlers.RotatingFileHandler rotates your logs based either on size or on date, but you can force it to rotate using RotatingFileHandler.doRollover() so something like:

import logging.handlers
import os

filename = "example.log"

# your logging setup

should_roll_over = os.path.isfile(filename)
handler = logging.handlers.RotatingFileHandler(filename, mode='w', backupCount=5)
if should_roll_over:  # log already exists, roll over!
    handler.doRollover()

# the rest of your setup...

应该像护身符一样工作.

Should work like a charm.

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