[root@zz test]# cat a1.py 
#!/usr/bin/python
# -*- coding:utf-8 -*-
#
# ithomer.net

import logging
import logging.handlers

LOG_FILE = 'tst.log'

handler = logging.handlers.RotatingFileHandler(LOG_FILE, maxBytes = 1024*1024*10, backupCount=5)

fmt = '%(asctime)s - %(filename)s:%(lineno)s - %(name)s - %(levelname)s - %(message)s'
formatter = logging.Formatter(fmt)
handler.setFormatter(formatter)

logger = logging.getLogger('tst')
logger.addHandler(handler)
logger.setLevel(logging.DEBUG)

logger.info('info msg')
logger.debug('debug msg')
for i in range(1, 100000):
    logger.info(str(i))
    

[root@zz test]# date;stat tst.log 
Fri Dec 22 23:18:56 CST 2023
  File: `tst.log'
  Size: 4601678       Blocks: 8992       IO Block: 4096   regular file
Device: 803h/2051d    Inode: 948538      Links: 1
Access: (0644/-rw-r--r--)  Uid: (    0/    root)   Gid: (    0/    root)
Access: 2023-12-22 23:18:49.158997975 +0800
Modify: 2023-12-22 23:18:56.041999938 +0800
Change: 2023-12-22 23:18:56.041999938 +0800

[root@zz test]# date;stat tst.log 
Fri Dec 22 23:20:03 CST 2023
  File: `tst.log'
  Size: 8868541       Blocks: 17328      IO Block: 4096   regular file
Device: 803h/2051d    Inode: 948699      Links: 1
Access: (0644/-rw-r--r--)  Uid: (    0/    root)   Gid: (    0/    root)
Access: 2023-12-22 23:19:54.939999936 +0800
Modify: 2023-12-22 23:20:03.068999937 +0800
Change: 2023-12-22 23:20:03.068999937 +0800

[root@zz test]# stat tst.log.1
  File: `tst.log.1'
  Size: 52428765      Blocks: 102400     IO Block: 4096   regular file
Device: 803h/2051d    Inode: 948538      Links: 1
Access: (0644/-rw-r--r--)  Uid: (    0/    root)   Gid: (    0/    root)
Access: 2023-12-22 23:18:49.158997975 +0800
Modify: 2023-12-22 23:19:54.939999936 +0800
Change: 2023-12-22 23:19:54.939999936 +0800