凯撒加密是最简单的加密算法，代码如下 ：def kaisa(n):#加密函数for m in n:if m==" ":return ' 'elif 97<=ord(m)<123-key or 65<=ord(m)<91-key:#位移值不超过最后一个z字母m=chr(ord(m)+key)return melif ord(m)>=123-key or 91-key&l