Basic python logging configuration

log.py

import logging
from logging.handlers import RotatingFileHandler
import traceback

logger = logging.getLogger()
logger.setLevel(logging.DEBUG)

handler = RotatingFileHandler('app.log', mode='a', maxBytes=50e6, backupCount=2)
formatter = logging.Formatter('%(asctime)s,%(message)s', datefmt='%Y-%m-%d %H:%M:%S')
handler.setFormatter(formatter)
handler.setLevel(logging.DEBUG)

logger.addHandler(handler)

# Example to capture generic exceptions
try:
    logger.info('{},{}'.format(impath, 'Starting to process'))
    ...
    logger.info('{},{}'.format(impath, 'Face processed'))
except Exception as e:
    traceback_info = ''.join(traceback.format_exception(*sys.exc_info()))
    logger.error('{},{},{},{}'.format('', '', '', 'ERROR - {} - {}'.format(e, traceback_info)))