Rotating_File_Handler.py

import logging
from logging.handlers import RotatingFileHandler

logger = logging.getLogger(__name__)
logger.setLevel(logging.INFO)

# roll over after 2KB, and keep backup logs app.log.1, app.log.2 , etc.
handler = RotatingFileHandler('app.log', maxBytes=2000, backupCount=5)
logger.addHandler(handler)

for i in range(10000):
    logger.info(i)
    
------------------------------------OUTPUT------------------------
YOu will see five files app.log.1, app.log.2 and so on. Files contains the recent log report. Everyfile starts from the end of previous file.
For Example: app.log - 9843-9999 
             app.log.1 - 9510-9842
             app.log.2 -  9177 -9509
             ....
             ....