並前往https://python-ecw.com/2021/05/05/python-for%E7%9A%84%E6%87%89%E7%94%A8%EF%BC%8C%E9%80%86%E8%BF%B4%E5%9C%88-slice%E7%9A%84%E6%87%89%E7%94%A8/