https://blog.gongquiz.com/2021/04/07/%ed%8c%8c%ec%9d%b4%ec%8d%ac-%eb%84%98%ed%8c%8c%ec%9d%b4-23%eb%b6%84%ec%97%90-%eb%81%9d%eb%82%b4%ea%b8%b0-python-numpy-%eb%8d%b0%ec%9d%b4%ed%84%b0-%ec%82%ac%ec%9d%b4%ec%96%b8%ec%8a%a4-%d0%b7/