Python3 logging example

logger.py

import logging
import os


LOG_ENVIRON = "LOGLEVEL"
LOG_LEVEL_DEFAULT = logging.INFO
LOG_FILE = "/tmp/myapplication.log"
LOG_FORMAT = '%(asctime)-15s [%(levelname)s] %(message)s'
LOG_NAME = "myapplication"


def _get_log_level():
    log_level = LOG_LEVEL_DEFAULT

    if LOG_ENVIRON in os.environ:
        log_level_name = os.environ[LOG_ENVIRON].upper()
        log_level_int = logging.getLevelName(log_level_name)
        if isinstance(log_level_int, int):
            log_level = log_level_int

    return log_level


def init():
    level = _get_log_level()

    log = logging.getLogger(LOG_NAME)
    log.setLevel(level)

    log_formatter = logging.Formatter(LOG_FORMAT)

    file_handler = logging.FileHandler(LOG_FILE)
    file_handler.setFormatter(log_formatter)
    file_handler.setLevel(level)
    log.addHandler(file_handler)

    stream_handler = logging.StreamHandler()
    stream_handler.setFormatter(log_formatter)
    stream_handler.setLevel(level)
    log.addHandler(stream_handler)

    return log


def get():
    return logging.getLogger(LOG_NAME)