Python logging example

python_logging.py

#!/usr/bin/env python3
import logging


def setup_logger(name, filename=None):
    logger = logging.getLogger(name)
    logger.setLevel(logging.DEBUG)
    fmt_string = ('[%(levelname)s|%(filename)s:%(lineno)s] %(asctime)s >'
                  ' %(message)s')
    fmt = logging.Formatter(fmt_string)
    sh = logging.StreamHandler()
    sh.setFormatter(fmt)
    logger.addHandler(sh)

    if filename is not None:
        fh = logging.FileHandler(filename)
        fh.setFormatter(fmt)
        logger.addHandler(fh)

    return logger


if __name__ == "__main__":
    logger = setup_logger('test', filename='test.log')
    logger.error('test')