Shachar Hamuzim Rajuan Shachar Hamuzim Rajuan - 1 year ago 84
Python Question

How to make log file copy in python?

I want to make log file in python same as in log4j,
meaning as soon the logger.log file get's to a size of 1K make a copy of this file and call it logger(1).log , In case logger(1),log already exists create logger(2).log and of course delete logger.log so next time it will run it will start a clean log.

This is my code but it is good only for first creation of logger file bakup:

b = os.path.getsize('logger.log')
print b
if b >= 1000:
shutil.copy2('logger.log', 'logger(1).log')

This is my file so it can be used globally:

import os
import logging
from logging.config import fileConfig
from logging import handlers

def setup_custom_logger():
configFolder = os.getcwd() + os.sep + 'Conf'
fileConfig(configFolder + os.sep + 'logging_config.ini')
logger = logging.getLogger()
# create a file handler
handler = logging.handlers.RotatingFileHandler('logger.log', maxBytes=1024, encoding="UTF-8")
# create a logging format
formatter = logging.Formatter('%(asctime)s - %(name)s - %(levelname)s - %(message)s')
return logger

Answer Source

You need to setup a RotatingFileHandler:

import logging
from logging import handlers

logger = logging.getLogger(__name__)
handler = handlers.RotatingFileHandler('logger.log', maxBytes=1000, backupCount=10, encoding="UTF-8")

From the documentation:

You can use the maxBytes and backupCount values to allow the file to rollover at a predetermined size. When the size is about to be exceeded, the file is closed and a new file is silently opened for output. Rollover occurs whenever the current log file is nearly maxBytes in length.

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