Python logging define schedule erase of log file

Question

Below is my current logging configuration.

I would like to know how can I get my log file cleared every 2 days, as I do have my script running on crontab schedule daily during the day.

logger = logging.getLogger('MyLog')
logger.setLevel(logging.INFO)
formatter = logging.Formatter(
    '%(asctime)s - %(name)s - %(levelname)-5.5s - %(message)s', "%Y-%m-%d %H:%M:%S")
file_handler = logging.FileHandler(
    'MyLog.log', 'a', encoding='utf-8')
file_handler.setFormatter(formatter)
logger.addHandler(file_handler)

Here's an Example which supposed to clear the log file after each 2 min.

import logging
from logging.handlers import TimedRotatingFileHandler

logger = logging.getLogger('MyLog')
logger.setLevel(logging.INFO)
formatter = logging.Formatter(
    '%(asctime)s - %(name)s - %(levelname)-5.5s - %(message)s', "%Y-%m-%d %H:%M:%S")

file_handler = TimedRotatingFileHandler(
    filename='MyLog.log', when='M', interval=2, encoding='utf-8')

file_handler.setFormatter(formatter)
logger.addHandler(file_handler)
logger.info('Hi')

Output after several running is below (log file not cleared):

2021-04-24 23:14:24 - MyLog - INFO  - Hi
2021-04-24 23:15:26 - MyLog - INFO  - Hi
2021-04-24 23:15:33 - MyLog - INFO  - Hi
2021-04-24 23:15:39 - MyLog - INFO  - Hi
2021-04-24 23:15:40 - MyLog - INFO  - Hi
2021-04-24 23:15:57 - MyLog - INFO  - Hi
2021-04-24 23:16:07 - MyLog - INFO  - Hi
2021-04-24 23:16:11 - MyLog - INFO  - Hi
2021-04-24 23:16:16 - MyLog - INFO  - Hi
2021-04-24 23:16:22 - MyLog - INFO  - Hi
2021-04-24 23:16:23 - MyLog - INFO  - Hi
2021-04-24 23:16:34 - MyLog - INFO  - Hi
2021-04-24 23:17:08 - MyLog - INFO  - Hi

@jonrsharpe Thanks, i came across that before posting my question. but just want to confirm if that's will handle the job ? TimedRotatingFileHandler(filename='MyLog.log', when='D', interval=2, encoding='utf-8') — αԋɱҽԃ αмєяιcαη
– αԋɱҽԃ αмєяιcαη, Commented Apr 24, 2021 at 21:10
Perhaps you could test it (maybe on a shorter timescale...) and find out? — jonrsharpe
– jonrsharpe, Commented Apr 24, 2021 at 21:10
@jonrsharpe i tried that out with 2 minute interval here but the log file didn't cleared. — αԋɱҽԃ αмєяιcαη
– αԋɱҽԃ αмєяιcαη, Commented Apr 24, 2021 at 21:18
Then I'd suggest you give a minimal reproducible example of that. — jonrsharpe
– jonrsharpe, Commented Apr 24, 2021 at 21:19

Dylan B. · Accepted Answer · 2021-04-25 17:24:15Z

1

file_handler = TimedRotatingFileHandler(
  filename='MyLog.log', when='D', interval=2, encoding='utf-8', backupCount=1)

You need a backupCount parameter to delete the old log files.

answered Apr 25, 2021 at 17:24

Dylan B.

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