python 로깅 관련 참고 사이트

https://docs.python.org/3/howto/logging-cookbook.html#logging-to-a-single-file-from-multiple-processes 

https://fangpenlin.com/posts/2012/08/26/good-logging-practice-in-python/

https://stackoverflow.com/questions/8467978/python-want-logging-with-log-rotation-and-compression