>>> a = ["aaa","bbb","ccc","ddd"] >>> a[1] = "xxx" ## 修改第二个元素
>>> a ['aaa', 'xxx', 'ccc', 'ddd'] >>> a[2:4] = ["mmm","nnn"] ## 修改第三和第四个元素 >>> a ['aaa', 'xxx', 'mmm', 'nnn'] >>> a = ["aaa","bbb","ccc","ddd","eee","fff","ggg","hhh"] >>> len(a) 8
>>> a[::2] ['aaa', 'ccc', 'eee', 'ggg'] >>> a[::2] = ["111","222","333","444"] >>> a ['111', 'bbb', '222', 'ddd', '333', 'fff', '444', 'hhh'] >>> a[::-2] ['hhh', 'fff', 'ddd', 'bbb'] >>> a[::-2] = ["xxx","yyy","zzz","000"] >>> a ['111', '000', '222', 'zzz', '333', 'yyy', '444', 'xxx']