Python standard logging module

gistfile1.py

import logging
from logging import handlers

logger = logging.getLogger()
# Change logging level here (CRITICAL, ERROR, WARNING, INFO or DEBUG)
logger.setLevel(logging.DEBUG)

formatter = logging.Formatter('%(asctime)s - %(levelname)s - %(message)s')

# Logging variables
MAX_BYTES = 200000
# Max number appended to log files when MAX_BYTES reached
BACKUP_COUNT = 5
log_file = 'log.txt'

fh = logging.handlers.RotatingFileHandler(log_file,
                                          'a',
                                          MAX_BYTES,
                                          BACKUP_COUNT)
fh.setLevel(logging.DEBUG)
fh.setFormatter(formatter)
logger.addHandler(fh)

# Uncomment this block if you would like to log to the console.
ch = logging.StreamHandler()
ch.setLevel(logging.DEBUG)
ch.setFormatter(formatter)
logger.addHandler(ch)

logger.info('And here\'s a sample INFO log message')