https://blog.gongquiz.com/2021/10/02/12-%eb%ac%b8%ec%9e%90%ec%97%b4-%ed%8c%8c%ec%9d%b4%ec%8d%ac-%ea%b0%95%ec%a2%8c-%ec%bd%94%eb%94%a9-%ea%b8%b0%ec%b4%88-%ea%b0%95%ec%9d%98-python-%ea%b9%80%ec%99%bc%ec%86%90%ec%9d%98-%ec%99%bc/