https://spoqa.github.io/2012/08/03/about-python-coding-convention.html
https://wayhome25.github.io/python/2017/05/04/pep8/
https://b.luavis.kr/python/python-convention
https://www.python.org/dev/peps/pep-0008/
[두다지 week2] python style guide
develop, python, dudaji