https://rein.kr/posts/2013-01-13-python-%EA%B8%B0%EB%B0%98%EC%9D%98-static-page-%EC%83%9D%EC%84%B1%EA%B8%B0%EB%A1%9C-%EB%B8%94%EB%A1%9C%EA%B7%B8%EB%A5%BC-%EC%98%AE%EA%B8%B0%EB%A0%A4%EB%8A%94-%EC%A4%91/