How to rotate log files in Python

noob_coder 0
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I came across rotating file handler in order to rotate log file in Python, I have this piece of code.

My requirement is my log file is getting appended every few seconds, and there should be log rotation, whenever the file is beyond 1 GB of size.

This is my pseudo code, where I am trying only for 40 bytes, to check if my code works.

import logging
import time
from logging.handlers import RotatingFileHandler
#----------------------------------------------------------------------
def create_rotating_log(path):
    """
    Creates a rotating log
    """
    logger = logging.getLogger("Rotating Log")
    logger.setLevel(logging.INFO)
    
    # add a rotating handler
    handler = RotatingFileHandler(path, maxBytes=40,
                                  backupCount=1)
    logger.addHandler(handler)
    
#----------------------------------------------------------------------
if __name__ == "__main__":
    log_file = "test.log"
    create_rotating_log(log_file)

Now as per this code, whenever my log file reaches 40 bytes, there should be a copy of the log file as test.log.1 and my older log file should have new content. So, I manually opened my test.log file, added contents to it to make sure size > 40 bytes and ran this piece of code, but nothing happened.My requirement is my log file is getting appended every few seconds, and there should be log rotation, whenever the file is beyond 1 GB of size.

What is the correct way of running the code for my requirement?? I am stuck here. Can someone please help?

logging python
1 Answers

As it was adviced at the comment of @jordanm, I've tried

import logging
from logging.handlers import RotatingFileHandler
#----------------------------------------------------------------------
def create_rotating_log(path):
    """
    Creates a rotating log
    """
    logger = logging.getLogger("Rotating Log")
    logger.setLevel(logging.INFO)
    
    # add a rotating handler
    handler = RotatingFileHandler(path, maxBytes=40,
                                  backupCount=1)
    logger.addHandler(handler)
    
#----------------------------------------------------------------------
if __name__ == "__main__":
    log_file = "test.log"
    create_rotating_log(log_file)
    logger = logging.getLogger("Rotating Log")
    logger.info("Hello!")

It works.

userjJE110
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